Biology Chapter 10 - Mendel and Meiosis Flashcards
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Questions and Answers

What is an allele?

Alternative forms of a gene for each variation of a trait of an organism.

What is crossing over?

Exchange of genetic material between nonsister chromatids during prophase I of meiosis; results in new allele combinations.

What does diploid mean?

A cell with two of each kind of chromosome, containing a diploid, or 2n, number of chromosomes.

How is a dominant trait characterized?

<p>It is the observed trait that masks the recessive form of a trait.</p> Signup and view all the answers

What is an egg in terms of genetics?

<p>A haploid female sex cell produced by meiosis.</p> Signup and view all the answers

What is fertilization?

<p>Fusion of male and female gametes.</p> Signup and view all the answers

What are gametes?

<p>Male and female sex cells; sperm and eggs.</p> Signup and view all the answers

What is genetic recombination?

<p>A major source of genetic variation among organisms caused by reassortment or crossing over during meiosis.</p> Signup and view all the answers

What field of study does genetics belong to?

<p>Genetics is a branch of biology that studies heredity.</p> Signup and view all the answers

What is a genotype?

<p>The combination of genes in an organism.</p> Signup and view all the answers

What does haploid mean?

<p>A cell with one of each kind of chromosome, containing a haploid, or n, number of chromosomes.</p> Signup and view all the answers

What is heredity?

<p>The passing on of characteristics from parents to offspring.</p> Signup and view all the answers

What is heterozygous?

<p>When there are two different alleles for a trait.</p> Signup and view all the answers

What are homologous chromosomes?

<p>Paired chromosomes with genes for the same traits arranged in the same order.</p> Signup and view all the answers

What does homozygous mean?

<p>When there are two identical alleles for a trait.</p> Signup and view all the answers

What is a hybrid organism?

<p>Offspring formed by parents having different forms of a trait.</p> Signup and view all the answers

What is the law of independent assortment?

<p>Mendelian principle stating that genes for different traits are inherited independently of each other.</p> Signup and view all the answers

What is the law of segregation?

<p>Mendelian principle explaining that since each plant has two different alleles, it can produce two different types of gametes.</p> Signup and view all the answers

What is meiosis?

<p>Type of cell division where one body cell produces four gametes, each containing half the number of chromosomes as a parent's body cell.</p> Signup and view all the answers

What is nondisjunction?

<p>Failure of homologous chromosomes to separate properly during meiosis; results in gametes with too many or too few chromosomes.</p> Signup and view all the answers

What is phenotype?

<p>The outward appearance of an organism, regardless of its genes.</p> Signup and view all the answers

What is pollination?

<p>Transfer from male reproductive organs to female reproductive organs of plants, usually within the same species.</p> Signup and view all the answers

What is a recessive trait?

<p>A trait of an organism that can be masked by the dominant form of a trait.</p> Signup and view all the answers

What defines sexual reproduction?

<p>A pattern of reproduction that involves the production and subsequent fusion of haploid sex cells.</p> Signup and view all the answers

What is sperm?

<p>Haploid male sex cells produced by meiosis.</p> Signup and view all the answers

What is a trait?

<p>A characteristic that is inherited; can be either dominant or recessive.</p> Signup and view all the answers

What is a zygote?

<p>A diploid cell formed when a sperm fertilizes an egg.</p> Signup and view all the answers

Study Notes

Key Terms in Genetics and Meiosis

  • Allele: Alternate forms of a gene representing different variations of a trait in an organism.
  • Crossing Over: The exchange of genetic material between nonsister chromatids of homologous chromosomes during prophase I of meiosis, resulting in new allele combinations.
  • Diploid: A cell containing two sets of chromosomes (2n); has chromosomes in pairs, one from each parent.
  • Dominant Trait: A trait that is expressed over a recessive trait when present in an organism.
  • Egg: The haploid female sex cell produced through meiosis.
  • Fertilization: The process where male and female gametes unite to form a zygote.
  • Gamete: Reproductive cells (sperm and eggs) that are haploid, meaning they contain half the number of chromosomes as somatic cells.

Genetic Variability and Principles

  • Genetic Recombination: A process that generates genetic diversity among organisms, primarily caused by crossing over and reassortment during meiosis.
  • Genetics: The scientific study of heredity and variation in organisms.
  • Genotype: The internal genetic makeup of an organism, represented by the combination of alleles.
  • Haploid: A cell containing a single set of chromosomes (n), found in gametes.
  • Heredity: The transmission of genetic characteristics from parents to offspring.
  • Heterozygous: A genetic condition where an organism has two different alleles for a specific trait.

Chromosome Structure and Behavior

  • Homologous Chromosomes: Chromosome pairs, one from each parent, that contain the same genes arranged in the same order.
  • Homozygous: A genetic condition where an organism has two identical alleles for a specific trait.
  • Hybrid: Offspring resulting from the cross of parents with different traits, showcasing diverse genetic backgrounds.

Fundamental Laws of Genetics

  • Law of Independent Assortment: A principle stating that genes for separate traits are inherited independently of one another.
  • Law of Segregation: A principle explaining that during gamete formation, the allele pairs segregate from each other, leading to different allele combinations in gametes.

Cell Division and Development

  • Meiosis: A specialized type of cell division that produces four genetically diverse haploid gametes, crucial for sexual reproduction.
  • Nondisjunction: The improper separation of homologous chromosomes during meiosis, leading to gametes with abnormal chromosome numbers.
  • Phenotype: The observable physical characteristics of an organism, which are influenced by both genotype and environmental factors.

Reproductive Processes

  • Pollination: The transfer of pollen from male to female reproductive structures in plants, typically occurring within the same species.
  • Recessive Trait: A trait that can be overshadowed by a dominant trait; expressed only when two recessive alleles are present.
  • Sexual Reproduction: The process involving the formation of haploid gametes and their subsequent fusion to create new offspring.
  • Sperm: The haploid male sex cell generated through meiosis.
  • Trait: An inherited characteristic, which can be categorized as dominant or recessive.
  • Zygote: The diploid cell that forms as a result of fertilization, combining genetic material from both parents.

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Explore key concepts of genetics with these flashcards focused on Mendel's principles and meiosis. Each card provides a term along with its definition to enhance your understanding of genetic variations and processes. Perfect for students seeking to master crucial biology concepts.

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