AP Biology : Population Genetics

Study concepts, example questions & explanations for AP Biology

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Example Questions

Example Question #9 : Understanding Crossing Over

When in meiosis does crossing over occur?

Possible Answers:

Telophase I

Metaphase I

Interphase

Anaphase I

Prophase I

Correct answer:

Prophase I

Explanation:

Crossing over occurs during prophase I when parts of the homologous chromosomes overlap and switch their genes.

Example Question #1 : Understand Causes Of Genetic Variation

Which of the following affect the frequency of chromosomes of two linked genes crossing over?

Possible Answers:

Distance between the genes

Size of the gene

Size of the chromosome

Whether the genes are dominant or recessive

Correct answer:

Distance between the genes

Explanation:

The recombination frequency depends upon the distance between the genes; a larger distance between the genes increases the probability of crossing over occurring.

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