Question

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Which event in meiosis increases genetic variation within a population?
A. DNA condenses to form chromosomes.

B. Segments of chromosomes cross over.
C. Chromosomes duplicate themselves.
D. Chromosomes form pairs.

Answer 1

In meiosis, the event that increases genetic variation is chromosomal crossover, where homologous chromosomes exchange DNA segments during meiosis I, creating recombinant chromosomes.

Step-by-step explanation:

The event in meiosis that increases genetic variation within a population is chromosomal crossover. This occurs during meiosis I when homologous chromosomes pair up and exchange segments of their genetic material to form recombinant chromosomes. As a result of this crossover, the chromatids held together by the centromere are no longer identical. Consequently, when the chromosomes proceed to meiosis II and separate, the resulting daughter cells have a mix of alleles, each with a unique set of genetic information that increases genetic diversity within a population. Thus, the correct answer is B. Segments of chromosomes cross over.

Answer 2

Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote. Recombination or crossing over occur during prophase 1