GRE Subject Test: Biology : GRE Subject Test: Biology

Study concepts, example questions & explanations for GRE Subject Test: Biology

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Example Questions

Example Question #1 : The Cell Cycle

Crossing over occurs during which stage of meiosis?

Possible Answers:

Prophase I

Prophase II

Metaphase II

Metaphase I

Anaphase I

Correct answer:

Prophase I

Explanation:

In the process of meiosis, crossing over (the exchange of genetic material between homologous chromosomes resulting in recombination) only occurs during prophase I, when pairs of homologous chromosomes recombine during synapsis. This contributes to the increase in diversity due to sexual reproduction.

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