Genetic Recombination and Gene Mapping Lesson 9
18 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

In the context of gene mapping, what defines complete linkage between genes?

  • Genes showing various phenotypes
  • Genes located on different chromosomes
  • Genes that undergo frequent mutations
  • Genes that are always inherited as a single unit (correct)

What distinguishes recombinants in the context of genetic mapping?

  • They have identical alleles to the parental lines
  • They are always female offspring
  • They show unique patterns in the DNA
  • They result from crossing over in the female fruit flies (correct)

How do scientists typically identify genes with complete linkage?

  • When mutations occur in one of the genes (correct)
  • By looking for patterns in the chemical bases of DNA
  • By observing various phenotypes
  • Through examining different chromosomes

What characterizes genes that exhibit incomplete linkage?

<p>They show multiple phenotypes (C)</p> Signup and view all the answers

What is a key feature of markers used in genetic mapping?

<p>They show unique patterns in DNA of family members with specific traits (D)</p> Signup and view all the answers

Why is crossing over limited to female fruit flies in certain genetic crosses?

<p>Females have one X chromosome (B)</p> Signup and view all the answers

How does DNA recombination occur in terms of the location of genetic material exchange?

<p>Between homologous regions of chromosomes. (B)</p> Signup and view all the answers

What is the relationship between the frequency of recombination and the distance between genes on a chromosome?

<p>The frequency of recombination is directly proportional to the distance between genes. (B)</p> Signup and view all the answers

How does the strength of linkage between two genes vary with their distance on the chromosome?

<p>The linkage strength decreases with distance. (B)</p> Signup and view all the answers

What did Morgan hypothesize about the relationship between recombination frequency and gene distance?

<p>Recombination frequency decreases with gene distance. (B)</p> Signup and view all the answers

What type of regions in chromosomes line up in preparation for genetic material exchange?

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

According to Morgan, how did gene location affect their inheritance during recombination?

<p>Genes far apart are more likely to be inherited together. (D)</p> Signup and view all the answers

What is the defining characteristic of incomplete linkage?

<p>Recombination level between 0% and 50% (A)</p> Signup and view all the answers

What is the key feature of statistical linkage?

<p>Deviation from independent assortment (C)</p> Signup and view all the answers

How are syntenic genes defined?

<p>Genes physically located on the same chromosome (D)</p> Signup and view all the answers

Which biologist proposed the idea of crossing over and recombination?

<p>Thomas Hunt Morgan (C)</p> Signup and view all the answers

What did Thomas Hunt Morgan hypothesize about the frequency of recombination?

<p>Inversely proportional to gene distance (A)</p> Signup and view all the answers

Why did Thomas Hunt Morgan propose crossing over as a genetic mechanism?

<p>To explain the occurrence of linked traits (A)</p> Signup and view all the answers

More Like This

Mendelian Genetics Quiz
48 questions

Mendelian Genetics Quiz

PowerfulGreenTourmaline6778 avatar
PowerfulGreenTourmaline6778
Use Quizgecko on...
Browser
Browser