Biology Quiz on Chromosomes and Cell Types

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Questions and Answers

What term describes the phenomenon where the heterozygote exhibits a mixture of phenotypic characters from both homozygotes?

  • Incomplete dominance
  • Complete dominance
  • Dominance
  • Codominance (correct)

Which type of gene is known to cause the death of an organism?

  • Dominant lethal
  • Gene interaction
  • Lethal gene (correct)
  • Modifier gene

What do we call genes that modify the phenotypic effects of other genes quantitatively?

  • Modifier gene (correct)
  • Gene interaction
  • Genotype
  • Phenotype

Which diagram is commonly used to predict the outcomes of genetic crossbreeding?

<p>Punnett square (B)</p> Signup and view all the answers

What term refers to the full set of hereditary material in an organism?

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

An organism that has only one copy of each chromosome is referred to as what?

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

Which process is characterized by a cell dividing, copying its full genome, and producing genetically identical daughter cells?

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

Which law states that genes for different characters are inherited independently of one another?

<p>Law of Independent Assortment (B)</p> Signup and view all the answers

What term describes the two sister chromatids connected together in their centromere regions?

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

What happens to each chromatid during cell division?

<p>Chromatids separate from their sisters (B)</p> Signup and view all the answers

What type of genetic cross involves contrasting expressions of one trait?

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

What is an inherited factor that determines a biological characteristic of an organism called?

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

What do you call the two individual genes in a particular gene pair?

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

What term is used for a gene pair containing two identical alleles?

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

What does it mean when two different alleles are present in a single gene pair?

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

Which law states that the probability of two independent events occurring simultaneously is equal to the product of the probabilities of their individual occurrences?

<p>Product Law of Probability (B)</p> Signup and view all the answers

What is referred to as recombinant DNA or molecular cloning?

<p>Recombinant DNA technology (A)</p> Signup and view all the answers

What is the term for a small chromosomal section formed from pinching off?

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

What term describes an offspring possessing only maternal chromosomes?

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

Which cell type contains diploid numbers of chromosomes?

<p>Somatic cell (B)</p> Signup and view all the answers

Which tilapia species is known for being the most salt tolerant?

<p>Oreochromis hornotum (B)</p> Signup and view all the answers

What is the method of chromosomal manipulation where both sets of chromosomes come from the paternal parent?

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

Which of the following organisms has the largest recorded diploid number?

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

Which synthetic male hormone is used for direct hormonal sex reversal in sexually undifferentiated tilapia?

<p>Methyl testosterone (B)</p> Signup and view all the answers

In which phase of mitosis do chromosomes align at the equatorial plane?

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

Which phase of mitosis involves the separation of sister chromatids?

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

What term describes a group of individuals derived from a common genetic origin?

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

What is a mating strategy in which a hybrid is crossed with a parental type?

<p>Back cross (B)</p> Signup and view all the answers

What is the process by which the chromosome number is reduced from diploid to haploid?

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

What term describes the number, size, and shape of chromosomes in a species?

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

What is an approach to selective breeding that selects top-performing individuals from a mixed population?

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

The area where exchange of material occurs between non-sister chromatids is called?

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

Which type of genes have their phenotypic expression determined by the presence or absence of one of the sex hormones?

<p>Sex-limited genes (B)</p> Signup and view all the answers

Which type of genes have their dominance influenced by the sex of the bearer?

<p>Sex-influenced genes (A)</p> Signup and view all the answers

What describes the relationship between sex determination and the presence of particular chromosomes?

<p>Sex-linkage (C)</p> Signup and view all the answers

Which term refers to changes involving the whole genome or the entire set of chromosomes?

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

What occurs when one or more chromosomes of the normal set are lacking or characterized by an incomplete genome?

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

What refers to any organism in which the number of complete sets exceeds that of the diploid?

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

Which occurrence involves polyploids developing from hybrids between different species?

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

What does the presence of a section in chromosomes in excess of the normal amount refer to?

<p>Duplication or Repeats (C)</p> Signup and view all the answers

Flashcards

Centromere

A constricted region on a chromosome where spindle fibers attach during cell division.

Satellite

A small, knob-like structure found on some chromosomes, often associated with specific genes or functions.

Chromosome Numeration

The number of chromosomes present in the nucleus of a cell, typically expressed as a diploid number (2n).

Mitosis

A process of cell division that results in two daughter cells, each with the same number of chromosomes as the parent cell.

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Metaphase

The phase of mitosis where chromosomes line up along the equator of the cell.

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Anaphase

The phase of mitosis where sister chromatids separate and move to opposite poles of the cell.

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Interphase

The phase between cell divisions where the cell grows and prepares for mitosis.

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Meiosis

A type of cell division that reduces the number of chromosomes by half, producing gametes (sperm and egg cells) for sexual reproduction.

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Karyotype

A visual representation of an organism's chromosomes, arranged in order of size and shape.

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Chiasmata

The points where non-sister chromatids exchange genetic material during meiosis, resulting in genetic variation.

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Allele

An alternative form of a gene responsible for a specific characteristic.

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Monohybrid Cross

A cross between two individuals that differ in one trait.

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Dihybrid Cross

A cross between two individuals that differ in two traits.

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Punnett Square

A diagram used to predict the possible genotypes and phenotypes of offspring from a cross.

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Codominance

A condition where both alleles of a gene are expressed equally in the phenotype.

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Genome

The complete set of genetic material in an organism.

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Homozygous

A gene pair with two identical alleles.

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Heterozygous

A gene pair with two different alleles.

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Dominant Lethal

A gene variant that causes death when present in homozygous form.

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Modifier Genes

Genes that modify the expression of other genes.

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Inversion

A chromosomal mutation where a segment of a chromosome is flipped 180 degrees.

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Translocation

A chromosomal mutation where a segment of one chromosome is transferred to a non-homologous chromosome.

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Polyploid

Organisms with more than two sets of chromosomes.

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Aneuploidy

Organisms with an abnormal number of chromosomes.

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Allopolyploid

Organisms derived from the hybridization of two different species.

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Methyl Testosterone

A synthetic male hormone that is used to induce sex reversal in tilapia.

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Mass Selection

A breeding technique where individuals with desired traits are chosen for breeding.

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Transgenesis

The introduction of foreign genes into an organism's genome.

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Androgenesis

A method of chromosomal manipulation where both chromosomes in a zygote are paternal.

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Heritability

The proportion of phenotypic variation in a population that is due to genetic variation.

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Mutation

A spontaneous change in the DNA sequence of a gene or chromosome.

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Backcross

A cross between a hybrid individual and one of its parents.

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Sex Determination

The mechanism by which an organism's sex is determined.

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Study Notes

Chromosomal Structures and Functions

  • Centromere: Small chromosomal section where constrictions are found, results from pinching off during nuclear division.
  • Satellite: Chromosomal component that can exhibit constrictions.
  • Chromosome Numeration: Diploid numbers vary across species; organisms may have unique chromosome counts.

Chromosome Counts in Various Organisms

  • Protozoa can have a diploid number of 300 or more chromosomes.
  • Carp's diploid number is 104.
  • Starfish exhibit a diploid count of 36.
  • Green algae can possess a diploid number of 20.

Mitosis Phases

  • Metaphase: Characterized by the alignment of chromosomes at the equatorial plane.
  • Anaphase: The stage where sister chromatids separate and move to opposite poles.
  • Interphase: Involves growth and preparation for mitosis.

Meiosis

  • Process reducing chromosome number from diploid to haploid during sex cell formation.

Genetic Concepts

  • Karyotype: A number, size, and shape assessment of an organism's chromosomes.
  • Chiasmata: The points of exchange between nonsister chromatids during crossing over.
  • Allele: The inherited factor influencing biological characteristics.

Genetic Crosses

  • Monohybrid cross: Examines contrasting expressions of a single trait.
  • Dihybrid cross: Analyzes two traits at once.

Gene Interaction and Expression

  • Punnett square: A common diagram used for predicting crossbreeding outcomes.
  • Codominance: Heterozygotes express phenotypic characters of both homozygotes.

Genetics Terms

  • Genome: The complete set of hereditary material in an organism.
  • Homozygous: A gene pair with identical alleles.
  • Heterozygous: A gene pair with different alleles.

Dominance Relationships

  • Dominant lethal: A gene variant that can cause an organism's death.
  • Modifier genes: Alter phenotypic effects of other genes.

Chromosomal Mutations

  • Inversion: Rotation of a chromosome segment by 180 degrees.
  • Translocation: The transfer of chromosome segments to non-homologous chromosomes.

Polyploidy and Aeuploidy

  • Polyploid: Organisms with more than two sets of chromosomes.
  • Aeuploidy: Characterized by the presence or absence of chromosomes.
  • Allopolyploid: Organisms derived from interspecies hybridization.

Tilapia and Selective Breeding

  • Methyl testosterone: A synthetic male hormone used for sex reversal in tilapia.
  • Mass selection: An approach where top-performing individuals in a population are chosen for breeding.

Genetic Manipulation Techniques

  • Transgenesis: Introducing recombinant genes for traits like growth control.
  • Androgenesis: Method of chromosomal manipulation involving dual paternal chromosomes.

Additional Concepts

  • Heritability: The degree gene contribution to complex traits.
  • Mutation: A spontaneous change in gene or chromosome structure.
  • Back cross: Mating a hybrid with a parental type for genetic improvement.

Sex Determination

  • Genes influencing expression can be sex-limited or sex-influenced.
  • The presence of a Y chromosome typically determines male sex in many organisms.

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