Genetic Linkage in Drosophila Melanogaster
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Questions and Answers

What is the significance of a 50% recombination rate between two genes?

  • The genes are always unlinked and will never be inherited together.
  • The genes are located on the same chromosome but are very close together.
  • The genes are always linked and will never separate during crossing over.
  • The genes are on different chromosomes or are located far apart on the same chromosome. (correct)

What is the unit of measurement for recombination rates?

  • CentiMorgan (cM) (correct)
  • Morgan
  • Recombination fraction
  • Linkage frequency

What can be inferred about the relative positions of the eye colour, body colour, and wing size genes based on their recombination rates?

  • The genes are equally spaced from each other.
  • The eye colour and wing size genes are closest together.
  • The body colour and wing size genes are closest together.
  • The eye colour and body colour genes are closest together. (correct)

What is the relationship between recombination rate and physical distance between genes on a chromosome?

<p>A lower recombination rate indicates genes are closer together. (A)</p> Signup and view all the answers

What is the purpose of generating a genetic linkage map?

<p>To illustrate the relative positions of genes on a chromosome. (B)</p> Signup and view all the answers

What is the ratio of parental phenotypes expected in the offspring if linkage is complete?

<p>1:1 (A)</p> Signup and view all the answers

What is the primary reason for the absence of genetic consequences in chiasmata formation between sister chromatids in the same homologous chromosome?

<p>They are identical (D)</p> Signup and view all the answers

What is the significance of the recombination rate of 17% in the Drosophila melanogaster cross?

<p>It indicates that the genes are linked with a distance of 17 centiMorgan (C)</p> Signup and view all the answers

What is the process called when alleles from different genes come together in new combinations?

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

What is the term for the visible crossing-over points between chromatids in a tetrad?

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

What is the purpose of creating a genetic map of genes on a chromosome?

<p>To understand the inheritance patterns of traits (B)</p> Signup and view all the answers

Which of the following is a consequence of independent assortment of genes?

<p>Genes are inherited independently (B)</p> Signup and view all the answers

What is the purpose of creating genetic linkage maps?

<p>To locate genes on a chromosome and measure the distances between them (B)</p> Signup and view all the answers

What is the unit of measurement used to express the distance between genes on a chromosome?

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

What is the unit of measurement used to express the distance between genes on a genetic map?

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

What is the chromosomal location of the genes OPN1MW and OPN1LW?

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

Which of the following is a characteristic of linked genes?

<p>They are physically close to one another on the same chromosome (C)</p> Signup and view all the answers

What is the main reason why the wing size and body colour genes in Drosophila melanogaster are not sex-linked?

<p>Because they are on the same autosomal chromosome (A)</p> Signup and view all the answers

What is the genotype of the wild type females used in the experiment by Thomas Hunt Morgan and his team?

<p>b+ b+ vg+ vg+ (C)</p> Signup and view all the answers

What is the phenomenon demonstrated by Thomas Hunt Morgan in Drosophila melanogaster?

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

What is the purpose of crossing wild type females with males that have both mutant phenotypes in the experiment?

<p>To demonstrate genetic linkage between the two genes (C)</p> Signup and view all the answers

What is the significance of the superscript '+' symbol in Drosophila melanogaster gene notation?

<p>It identifies the wild type allele for the eye color gene (A)</p> Signup and view all the answers

What is the unit of measurement for the distance between two genes on a genetic linkage map?

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

What is the relationship between the number of genes and the number of chromosomes?

<p>The number of genes is much larger than the number of chromosomes (D)</p> Signup and view all the answers

What is the underlying principle of independent assortment, which is not observed in the case of genetic linkage?

<p>Genes are distributed randomly during gamete formation (A)</p> Signup and view all the answers

What did Morgan's discovery of an eye color mutant lead to?

<p>The first concrete demonstration that a gene is located on a specific chromosome (C)</p> Signup and view all the answers

What is the significance of the allele symbol 'w' in Drosophila melanogaster gene notation?

<p>It represents the mutant allele for the eye color gene (C)</p> Signup and view all the answers

What is the relationship between the behavior of the sex chromosomes and the behavior of the two alleles of the eye color gene?

<p>The behavior of the sex chromosomes can be correlated with the behavior of the two alleles of the eye color gene (C)</p> Signup and view all the answers

What is the purpose of correlating the behavior of the sex chromosomes with the behavior of the two alleles of the eye color gene?

<p>To demonstrate the chromosome theory of inheritance (B)</p> Signup and view all the answers

What is the consequence of independent assortment of genes on a chromosome?

<p>The recombination of alleles from different genes in new combinations (C)</p> Signup and view all the answers

What is the purpose of the Ishihara chart?

<p>To diagnose sex-linked color blindness (D)</p> Signup and view all the answers

What is the result of Morgan's discovery of an eye color mutant in terms of genetic mapping?

<p>The first concrete demonstration that a gene is located on a specific chromosome (B)</p> Signup and view all the answers

What is the relationship between the genetic distance between two genes and the recombination rate?

<p>The genetic distance between two genes is inversely proportional to the recombination rate (D)</p> Signup and view all the answers

What is the significance of the centiMorgan unit in genetic mapping?

<p>It is a measure of genetic distance between two genes (B)</p> Signup and view all the answers

What is the result of correlating the behavior of the sex chromosomes with the behavior of the two alleles of the eye color gene?

<p>The support for the chromosome theory of inheritance (C)</p> Signup and view all the answers

What is the expected ratio of phenotypes if genes assort independently?

<p>1:1:1:1 (C)</p> Signup and view all the answers

What is the primary reason for the underrepresentation of recombinant phenotypes in Morgan's experiment?

<p>Genes controlling body color and wing size are genetically linked (D)</p> Signup and view all the answers

What is the term used to describe the process of recombination between linked genes?

<p>Crossing-over (C)</p> Signup and view all the answers

What is the unit of measurement used to express the distance between two genes on a chromosome?

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

What is the term used to describe the process of genes moving through meiosis as a unit without being separated by recombination?

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

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