Question

moving to the next question prevents changes to this answer. question 47 without crossing over 1. cells could not complete meiosis. 2. meiosis could not produce haploid gametes. 3. only a small number of unique gametes could be produced by a single individual. 4. genetic recombination could not occur.

Explanation:

Crossing - over is a process in meiosis where homologous chromosomes exchange genetic material. It increases genetic diversity. Without crossing - over, the main impact is on genetic recombination.

• Option 1: Cells can still complete meiosis without crossing - over. Crossing - over is not a prerequisite for the completion of meiosis.
• Option 2: Meiosis can still produce haploid gametes without crossing - over. The reduction in chromosome number (to haploid) is mainly due to the two - stage division process (meiosis I and meiosis II), not crossing - over.
• Option 3: Independent assortment (another source of genetic variation in meiosis) can still produce a relatively large number of unique gametes. Crossing - over is an additional mechanism for increasing gamete diversity, but its absence does not limit the number of unique gametes to a “small number” in the context of the overall meiotic process (which includes independent assortment).
• Option 4: Genetic recombination is the exchange of genetic material. Crossing - over is a major mechanism of genetic recombination in meiosis. Without crossing - over, genetic recombination (in the form of exchange between homologous chromosomes) could not occur.

Answer:

1. genetic recombination could not occur.