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Example Questions
Example Question #1 : Understanding Crossing Over
When in meiosis does crossing over occur?
Possible Answers:
Prophase I
Telophase I
Interphase
Anaphase I
Metaphase 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 #4 : Understand Causes Of Genetic Variation
Which of the following affect the frequency of chromosomes of two linked genes crossing over?
Possible Answers:
Size of the chromosome
Whether the genes are dominant or recessive
Size of the gene
Distance between the genes
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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