Genetics and Organism Development Quiz
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Questions and Answers

What role do genes play in the development of an organism?

  • Genes directly determine behaviour and traits.
  • Genes create biochemical differences that influence development probabilistically. (correct)
  • Genes have no impact on environmental interactions during development.
  • Genes are responsible for forming chromosomes only.
  • How many pairs of chromosomes do humans typically have?

  • 24 pairs
  • 23 pairs (correct)
  • 22 pairs
  • 20 pairs
  • What is the relationship between a child's genotype and their phenotype?

  • The child's genotype contributes to the development of their phenotype. (correct)
  • The child's environment overrides the influence of their genotype.
  • The child's phenotype is strictly inherited from parents.
  • The child's genotype has no influence on their phenotype.
  • Which statement accurately describes chromosomes?

    <p>Chromosomes are long, threadlike molecules made up of DNA. (B)</p> Signup and view all the answers

    What is the influence of a child's phenotype on their environment?

    <p>The phenotype can create environmental conditions that modify development. (D)</p> Signup and view all the answers

    What is a consequence of maternal alcoholism during pregnancy?

    <p>Fetal alcohol syndrome (B)</p> Signup and view all the answers

    Which environmental factor is associated with low birth weight and retarded growth?

    <p>Cigarette smoking (B)</p> Signup and view all the answers

    Which of the following is a recommended practice to reduce the risk of SIDS?

    <p>Use firm mattresses for bedding (B)</p> Signup and view all the answers

    What state of arousal is characterized by the absence of motor activity and regular brain waves?

    <p>Quiet sleep (A)</p> Signup and view all the answers

    What role does brain activity during REM sleep play according to autostimulation theory?

    <p>It compensates for deprivation of external stimuli. (C)</p> Signup and view all the answers

    How does crying evolve during early infancy?

    <p>It becomes a more effective means of communication. (C)</p> Signup and view all the answers

    What percentage of a newborn's total sleep time is made up of REM sleep?

    <p>50% (D)</p> Signup and view all the answers

    What is one effective soothing technique for a crying infant?

    <p>Swaddling the baby in cloth. (A)</p> Signup and view all the answers

    How does REM sleep in newborns compare to that of young adults?

    <p>Newborns have more REM sleep (C)</p> Signup and view all the answers

    Which of the following is NOT considered a state of arousal in newborns?

    <p>Gentle transition (D)</p> Signup and view all the answers

    What characterizes resilient children according to developmental resilience?

    <p>They often receive responsive care from caregivers. (D)</p> Signup and view all the answers

    What is the typical sleep pattern of newborns compared to young adults?

    <p>Newborns sleep more than young adults (D)</p> Signup and view all the answers

    What is the genotype in the model of interaction?

    <p>The genetic material inherited from parents. (B)</p> Signup and view all the answers

    How do heredity and environment contribute to individual characteristics?

    <p>They interact to shape various traits. (B)</p> Signup and view all the answers

    What is a common risk factor in developmental outcomes?

    <p>Multiple associated negative factors. (B)</p> Signup and view all the answers

    What percentage of genetic difference exists between individuals?

    <p>Less than 1.5% (A)</p> Signup and view all the answers

    Which chromosome is associated with a higher likelihood of inherited disorders in males due to recessive alleles?

    <p>X chromosome (A)</p> Signup and view all the answers

    What is the primary focus of behavioral genetics?

    <p>The impact of environmental factors on genetic traits (A)</p> Signup and view all the answers

    What effect does the 2R variant of the MAOA gene have on behavior?

    <p>It increases the likelihood of committing serious crimes (C)</p> Signup and view all the answers

    How does high activity of the MAO-A gene influence the effects of maltreatment?

    <p>It reduces the impact of abuse on future criminal behavior (C)</p> Signup and view all the answers

    What does behavioral geneticists' belief about traits being multifactorial imply?

    <p>They result from a combination of both genetic and environmental influences (B)</p> Signup and view all the answers

    Which disorder is associated with a single dominant gene inheritance pattern?

    <p>Huntington’s disease (D)</p> Signup and view all the answers

    What is the chromosomal composition of a male at birth?

    <p>XY (C)</p> Signup and view all the answers

    What is a common characteristic of recessive genetic disorders?

    <p>Both alleles must be present for the disorder to manifest. (B)</p> Signup and view all the answers

    Which of the following conditions is a result of errors in meiosis?

    <p>Down syndrome (D)</p> Signup and view all the answers

    Which statement accurately describes the relationship between sickle-cell anemia and malaria?

    <p>Sickle-cell carriers have both disease and health benefits from the disorder. (C)</p> Signup and view all the answers

    What is the process through which the embryo's unspecialized stem cells become different types of cells?

    <p>Cell differentiation (A)</p> Signup and view all the answers

    What develops from the inner cell mass in a blastocyst?

    <p>Embryo (A)</p> Signup and view all the answers

    How do identical twins originate during early development?

    <p>From splitting of the inner cell mass (D)</p> Signup and view all the answers

    What does the placental membrane primarily protect against?

    <p>Some toxins and infectious agents (A)</p> Signup and view all the answers

    Which prenatal process enables the migration of cells to their destination in the embryo?

    <p>Cell migration (B)</p> Signup and view all the answers

    At what stage does the fetus begin to habituate to repeated stimuli?

    <p>32 weeks (C)</p> Signup and view all the answers

    What factor significantly influences the effects of teratogens during prenatal development?

    <p>Timing of exposure (D)</p> Signup and view all the answers

    Which of the following accurately describes experience-expectant plasticity?

    <p>Depends on common experiences in a normal environment (D)</p> Signup and view all the answers

    What is described as the movement of materials between the mother's bloodstream and that of the fetus?

    <p>Placental transfer (D)</p> Signup and view all the answers

    What term refers to the selective death of certain cells during prenatal development?

    <p>Apoptosis (D)</p> Signup and view all the answers

    What is one of the earliest forms of sensory experience for the fetus?

    <p>Taste and smell from amniotic fluid (D)</p> Signup and view all the answers

    What is characteristic of the cephalocaudal pattern of development?

    <p>Regions near the head develop earlier (C)</p> Signup and view all the answers

    What is one outcome if an expected experience is not provided during sensitive periods?

    <p>Development may be impaired (D)</p> Signup and view all the answers

    Flashcards

    Embryonic Period

    The stage of prenatal development that occurs from implantation to the 8th week, marked by the development of all major organs and body systems.

    Fetal Period

    The rapid increase in the size and complexity of the fetus, from the 9th week of pregnancy to birth.

    Cell Division

    The process by which the zygote divides repeatedly, increasing the number of cells.

    Cell Migration

    The movement of cells from their original location to a new position within the embryo.

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    Cell Differentiation

    The process of transforming unspecialized stem cells into specialized cells with specific functions.

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    Apoptosis

    The programmed death of certain cells, which is essential for development.

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    Sexual Differentiation

    Hormones play a key role in determining the sex of the fetus, with testosterone driving male development.

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    Blastocyst

    A hollow sphere of cells that forms about 4 days after conception.

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    Cephalocaudal Development

    The process of development that occurs from head to tail, with areas near the head developing earlier than those farther away.

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    Proximodistal Development

    The process of development that occurs from the center of the body outward, with organs and systems developing in a sequence.

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    Neural Tube

    A U-shaped groove that forms from the top layer of cells in the embryo and eventually becomes the brain and spinal cord.

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    Placenta

    The organ that connects the developing fetus to the mother, allowing for the exchange of nutrients and waste.

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    Umbilical Cord

    The tube that carries blood vessels from the placenta to the fetus and back.

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    Teratogens

    Environmental agents that can cause harm to a developing fetus during pregnancy.

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    Experience-Expectant Plasticity

    The process by which the brain develops due to the kinds of experiences that are common to all humans in typical environments.

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    Autostimulation Theory

    The theory suggests that brain activity during REM sleep in infants helps compensate for the lack of external stimulation, aiding in the development of the visual system.

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    Infancy Crying

    Crying in infants initially signals discomfort or frustration, but gradually evolves into a form of communication.

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    Soothing Techniques

    Swaddling, a technique that involves wrapping a baby tightly, provides a calming and reassuring sensation by mimicking the feeling of being held.

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    Colic

    Colic is characterized by excessive crying in infants without any apparent reason.

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    Multiple Risk Factors

    The occurrence of multiple risk factors in an individual's life increases the likelihood of a negative developmental outcome.

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    Developmental Resilience

    The ability to thrive despite facing significant developmental challenges.

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    Behavioral Genetics

    The study of how genetic and environmental factors interact to influence individual traits and behaviors.

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    Model of Interaction

    This model emphasizes the interplay between genotype (genetic makeup), phenotype (observable traits), and environment in shaping an individual.

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    Fetal Alcohol Syndrome (FAS)

    A condition caused by alcohol consumption during pregnancy, characterized by mental retardation, facial deformities, and other problems.

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    Cigarette Smoking During Pregnancy

    The act of smoking cigarettes while pregnant, which is linked to retarded growth and low birth weight for the baby.

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    REM Sleep

    Rapid eye movement sleep, an active sleep state characterized by quick eye movements. It's prominent in newborns, declining with age.

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    Non-REM Sleep

    A state of non-rapid eye movement sleep, characterized by quietness, slow brain waves, and regular breathing and heart rate.

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    State of Arousal

    The infant's level of arousal and engagement with the surrounding environment, ranging from deep sleep to intense activity.

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    Interacting With the Environment

    The infant's ability to interact with the world through their senses and actions, influenced by their state of arousal.

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    Negative Outcomes at Birth

    Negative outcomes occurring at birth, such as low birth weight, premature delivery, or health complications.

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    Genotype

    The complete set of genes that an individual possesses, passed down from parents.

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    Phenotype

    The observable characteristics of an individual, resulting from the interaction of genotype and environment.

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    Environmental Influence

    The influence of environmental factors on the development of an organism's phenotype.

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    Heredity

    The process by which genetic material is transmitted from parents to offspring.

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    Gene

    The basic unit of heredity, a segment of DNA that codes for a specific protein.

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    Genetic Mutation

    A change in the genetic sequence that can lead to a disease or disorder. It can involve a single gene or multiple genes.

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    Recessive Inheritance

    A pattern of inheritance where two copies of a recessive gene are required to express the trait.

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    Dominant Inheritance

    A pattern of inheritance where a single copy of a dominant gene is enough to express the trait.

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    Chromosomal Abnormality

    A disease caused by an error in the number of chromosomes. Examples include Down syndrome (trisomy 21) and Klinefelter syndrome (XXY).

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    Sex-Linked Inheritance

    Genes located on the X chromosome that can be inherited differently in males and females.

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    Male Disadvantage

    The Y chromosome has fewer genes than the X chromosome, making males more susceptible to inherited disorders caused by recessive alleles on the X chromosome.

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    MAO-A (Monoamine Oxidase A)

    An enzyme encoded by the MAOA gene, linked to aggression and antisocial behavior.

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    2R Variant of MAOA Gene

    A variation in the MAOA gene associated with increased likelihood of criminal behavior, especially in individuals who experienced severe maltreatment.

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    MAO-A and Abusive Experiences

    High MAOA activity can mitigate the impact of abuse on future criminal behavior, suggesting a protective effect against the negative effects of trauma.

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    Study Notes

    Prenatal Development Overview

    • Prenatal development encompasses the period from conception to birth, involving biological and behavioural factors.
    • The lecture covers various stages, including conception, early development, fetal behaviour, experience, and learning. It also examines hazards to prenatal development.
    • It includes a historical perspective, highlighting shifts in understanding developmental processes.
    • Recent research techniques and advances in genetics have revolutionized the study of embryology and prenatal development.

    Conception

    • Prenatal development begins with conception, the union of egg and sperm (gametes).
    • Gametes are formed through meiosis, a specialized cell division that results in gametes containing half the genetic material of normal body cells.
    • Sex differences arise at conception with approximately 120-150 male conceptions for every 100 female conceptions. The Y chromosome bearing sperm are lighter and swim faster than those bearing an X chromosome.

    The Zygote

    • The fertilized egg, or zygote, has a complete set of human genetic material (half from each parent).
    • The zygote marks the start of three prenatal development periods: germinal, embryonic, and fetal.
    • The three periods describe the significant phases of development from conception to birth.

    Periods of Prenatal Development

    • Germinal Period (0-2 weeks): Rapid cell division happens after conception, leading to implantation in the uterine wall.
    • Embryonic Period (3-8 weeks): Major development in organs and systems occurs through cell division, migration, differentiation, and cell death, alongside hormonal influences.
    • Fetal Period (9 weeks - birth): Continued physical structure development, rapid growth of the body, increasing behavioural and sensory experiences, and learning.

    The Cells

    • Prenatal development involves four key processes: cell division leading to proliferation, cell migration, cell differentiation, and apoptosis (programmed cell death).
    • These actions contribute to the transformation of the zygote to a fetus.
    • Cell differentiation results in the formation of over 350 different cell types in the embryo.

    The Role of Hormones

    • Hormones, particularly testosterone, play a crucial role in sexual differentiation.
    • Human fetuses initially have the potential for both male and female genitalia that develop depending on the presence or absence of testosterone.
    • Fetal development encompasses various processes, not just the development of physical traits, but also the influence on their own environment and behaviour development.

    The Blastocyst

    • By the fourth day after conception, the zygote transforms into a blastocyst, a hollow sphere of cells with an inner cell mass (ICM) on one side.
    • The inner cell mass eventually forms the embryo.

    Identical vs. Fraternal Twins

    • Identical twins arise from the splitting of the inner cell mass, resulting in genetically identical individuals (100%).
    • Fraternal twins result from two eggs being released and fertilized by different sperm, leading to siblings who are genetically similar (50%).

    The Embryo

    • After implantation, the ICM develops into the embryo and associated support systems like the neural tube.
    • The neural tube, formed from differentiated cells, eventually becomes the brain and spinal cord.
    • The developing embryo relies on a support system—the placenta and umbilical cord.

    Protecting the Fetus

    • The placental membrane shields the fetus from some toxins and infectious agents.
    • The amniotic sac, filled with fluid, provides a protective cushion for the fetus.

    Fetus Development Stages

    • Images of fetuses at various stages of development (e.g., 4, 9, 11, 16, 18, 20, 28 weeks) are presented. Note each stage represents a specific point of development.

    Fetus Learning

    • The fetus exhibits learning capabilities, such as decreased responses to repeated stimulation (habituation).
    • Newborns demonstrate the ability to recognise rhymes and stories heard prenatally, indicating fetal learning influences postnatal abilities.

    Sensitive Periods

    • Sensitive periods in early brain development correlate with specific times in development, and are indicative of periods where the brain is most receptive to new types of input.

    Experience-Expectant vs. Experience Dependent Plasticity

    • Experience-expectant plasticity describes consistent early development resulting from experiences common to all (or most) individuals.
    • Experience-dependent plasticity refers to neural changes that result from specific individual experiences.

    Teratogens

    • Teratogens are environmental agents capable of causing harm during prenatal development, and timing of exposure is crucial for understanding the effects.
    • Timing is crucial; damage depends on the phase of development a teratogen is encountered.
    • Examples include alcohol, drugs (e.g., cocaine, heroin), maternal illnesses, and environmental pollutants.

    Some Environmental Hazards

    • This includes various drugs and maternal diseases.
    • Teratogens, including substances like mercury and PCBs, are harmful to a developing fetus.
    • Teratogens can lead to various negative outcomes, including birth defects, developmental delays, and mental retardation

    Maternal Alcoholism

    • Maternal alcoholism can cause Fetal Alcohol Syndrome (FAS), characterized by mental retardation, facial deformities, and other health issues.

    Cigarette Smoking

    • Cigarette smoking during pregnancy can result in retarded growth and low birth weight.
    • Smoking is associated with increased risk of sudden infant death syndrome (SIDS).
    • Risk factors to consider are exposure time and amount of a teratogen.

    The Newborn Infant

    • The newborn infant exhibits particular states of arousal.
    • Physiological indicators of arousal include measurable states of sleep (e.g., active, quiet) and alertness (e.g., active awake, alert awake, drowsing).
    • Significant variations in amount of each state of sleep and alertness are possible.

    Interacting With The Environment

    • A newborn's state of arousal and engagement level influence their exploration of the environment.
    • Experience of the environment and states of arousal relate strongly to an infant's interaction with the environment.

    Six States of Arousal

    • A newborn's state of arousal represents different stages of activity and alertness.

    Newborn States

    • A pie chart illustrates the approximate time spent in each state of arousal.

    Sleep

    • REM (rapid eye movement) sleep constitutes the major portion of sleep during early development.
    • Non-REM sleeps occur during early developmental periods and represents significant periods of development.
    • Autostimulation theory discusses the important role of REM sleep in fetal and newborn development and how it facilitates the development of the visual system.

    Crying

    • Crying in infants initially reflects discomfort or frustration, but with experience, parents improve at interpreting its meaning.
    • Parents develop techniques to soothe infants.
    • There are multiple factors that influence a newborn's development, which requires the understanding of parents to develop effective techniques.

    Risk Factors

    • Negative outcomes are more likely when several risk factors are present.

    Developmental Resilience

    • Resilience to negative factors involves successful developmental outcomes despite risks. Children with responsive care and specific characteristics like intelligence or responsiveness to others often develop resilience.

    Genetic and Environmental Forces

    • Heredity and environment interact in complex ways to influence characteristics.
    • Behavioural geneticists investigate how genes and environment interact, focusing on multifactorial traits.

    Model of Interaction

    • Genotype (genetic makeup) and environment interact to produce phenotype (observable characteristics).

    Fundamental Relations

    • Parents' genetic make-up contributes to the child's genotype.
    • The child's genotype influences their phenotype (observable characteristics).
    • The child's environment impacts the development of their phenotype.

    Genetics

    • Genetic material (chromosomes made of DNA) carries instructions for all biochemical processes.
    • Genes are the units of heredity but don't directly code for traits.
    • Traits result from cellular processes involving interaction between genes and environment.

    Alleles

    • Many genes have different forms called alleles.
    • Dominant alleles are expressed if present.
    • Recessive alleles are expressed only if both alleles are recessive.
    • Homozygous individuals have matching alleles, while heterozygous individuals have different alleles for a gene.

    Genes Work Together

    • Traits often involve multiple genes (polygenic inheritance).
    • Some genes influence multiple traits (pleiotropy).
    • Examples like Phenylketonuria (PKU) highlight how genes and environment interact to influence development.

    Genetic Origins of Human Diseases

    • Many diseases and disorders result from genetic factors.
    • Disorders can be associated with recessive genes, single genes, sex-linked inheritance, or errors in meiosis.

    Dominant vs. Recessive Inheritance

    • Illustrations demonstrate how dominant and recessive traits are passed down through generations.

    Genetic Origins of Human Diseases and Disorders

    • Some genes have both positive and negative effects (e.g., sickle-cell anemia, protecting against malaria).
    • Genetic basis of certain syndromes like dyslexia and Tourette's is not always fully understood.

    Sex Chromosomes

    • The 23rd pair of chromosomes determines biological sex (XX for females; XY for males).
    • The Y chromosome carries genes crucial for triggering male sexual development.
    • The Y chromosome, containing significantly fewer genes, can be vulnerable to harmful recessive traits compared to the X chromosome.

    The Male Disadvantage

    • The Y chromosome, having fewer genes than the X, means males are often more susceptible to certain kinds of disorders.
    • Inherited disorders caused by recessive alleles on the X-chromosome result in a vulnerability for males.

    Behavioral Genetics

    • Behavioural genetics studies how environmental and genetic factors influence behaviour.

    The Case of MAO-A

    • MAOA gene activity influences aggression differently based on environmental exposure during early childhood.
    • Individuals' genes can predispose them, but environment plays a crucial role in how that affects developmental pathways of the individual.

    Children's Own Behaviour

    • Children actively shape their environment, evoking reactions in others and selecting experiences.
    • Their behaviour influences their environment.
    • Experience varies by individual, and individuals' experiences also vary by their environment, which can influence how they develop.

    The Family Study

    • Family studies investigate trait correlations among genetically related individuals.
    • Comparisons are conducted between genetically related individuals versus genetically unrelated individuals to assess the role of similar environments.

    Types of Family Studies

    • Twin-study designs compare monozygotic (identical) and dizygotic (fraternal) twins.
    • Adoption studies investigate correlations between adopted children and their biological and adoptive relatives.

    Minnesota Study of Twins Reared Apart

    • This study highlights the significant role of genetic factors in traits like IQ.
    • Environmental factors influence development, particularly in shaping behaviours relevant to stressors or situations of interest to individuals/environment.

    Average Familial IQ Correlations

    • Measures the correlation between IQ scores in different family relationships (biological twins, siblings, etc.); this is also relevant to studies of hereditary versus environment.

    Heritability

    • Heritability estimates the proportion of trait variation in a population due to genetic factors.
    • Heritability is a population-level estimate and does not explain individual behaviours.
    • Heritability estimates need to be contextualized within the environment.

    Shared vs. Nonshared Factors

    • Shared environmental factors influence siblings similarly.
    • Nonshared environmental factors produce unique experiences among siblings, impacting development differently based on specific experiences.

    Next Week

    • The next lecture will cover physical and cognitive development in infancy and toddlerhood.

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    Description

    Test your knowledge on the fundamental concepts of genetics and their roles in organism development. Explore key ideas such as chromosomes, genotypes, phenotypes, and their interactions with the environment. Perfect for students studying biology or related subjects.

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