Question

what would be likely to occur if crossing over did not happen during meiosis?
a. there would be less genetic variation.
b. offspring would have twice as many chromosomes.
c. parent cells would not produce gametes.
d. genetic traits would not be passed on to offspring

Explanation:

Crossing over is a process in meiosis where homologous chromosomes exchange genetic material, which is a key source of genetic variation in gametes and offspring. Without it, this specific mechanism for creating new genetic combinations is lost, leading to reduced genetic variation. Option B is incorrect because chromosome number doubling is related to failed cytokinesis or nondisjunction, not lack of crossing over. Option C is wrong because gametes are still produced via meiosis even without crossing over. Option D is incorrect because genetic traits are passed on through the chromosomes in gametes, which are still formed without crossing over.

Answer:

A. There would be less genetic variation.