During meiosis, what happens to the chromosome number in gametes?

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Study for the 9th Grade Biology SOL Test. Prepare with flashcards and multiple choice questions, each featuring hints and explanations. Get ready for your exam!

Multiple Choice

During meiosis, what happens to the chromosome number in gametes?

Explanation:
During meiosis the chromosome number in gametes is halved. This creates haploid cells, which contain one complete set of chromosomes, so when a sperm and egg fuse during fertilization, the diploid chromosome number is restored in the zygote. The reduction happens because meiosis has two rounds of division: homologous chromosomes separate in the first division, cutting the chromosome count in half, and then sister chromatids separate in the second division. Crossing over can shuffle genes among homologs, but it doesn’t change the chromosome count.

During meiosis the chromosome number in gametes is halved. This creates haploid cells, which contain one complete set of chromosomes, so when a sperm and egg fuse during fertilization, the diploid chromosome number is restored in the zygote. The reduction happens because meiosis has two rounds of division: homologous chromosomes separate in the first division, cutting the chromosome count in half, and then sister chromatids separate in the second division. Crossing over can shuffle genes among homologs, but it doesn’t change the chromosome count.

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