Question

Which of the following statements is true of crossing-over?

A. Crossing-over contributes to genetic diversity or variation.
B. The gene for eye color can be exchanged with the gene for hair color during crossing-over.
C. Only one gene may be exchanged at a time during crossing-over.
D. Crossing-over always results in a non-beneficial mutation.

Answer 1

Answer: Crossing-over contributes to genetic diversity or variation.

Crossing-over is when homologous* chromosomes exchange genes. This result in different gene combinations.

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*A pair of matching chromosomes. They have the same genes but can have different versions.

Answer 2

A. Crossing-over contributes to genetic diversity or variation.

Step-by-step explanation:

Crossing over is the process of exchange of genetic material between non sister chromatids of homologous chromosomes and creates new gene combinations. It occurs during pachytene stage of prophase of meiosis I and forms gametes with genetic variations. The new gene combinations may or may not be beneficial for the organism.