Question

question 2 how does crossing over create genetic variation? it results in exact copies of chromosomes it causes genetic mutations in chromosomes it results in the swapping of genes on homologous chromosomes

Explanation:

To determine how crossing over creates genetic variation, let's analyze each option:

• Option 1: "it results in exact copies of chromosomes" — Crossing over does not create exact copies; that would not lead to variation. So this is incorrect.
• Option 2: "it causes genetic mutations in chromosomes" — Crossing over is the exchange of genetic material, not causing mutations (mutations are changes in DNA sequence, while crossing over is a recombination). So this is incorrect.
• Option 3: "it results in the swapping of genes on homologous chromosomes" — During crossing over, segments of homologous chromosomes are exchanged, which shuffles the genetic material and creates new combinations of alleles, thus leading to genetic variation. This matches the mechanism of crossing over.

Answer:

C. it results in the swapping of genes on homologous chromosomes (assuming the third option is labeled C; if the original labels were different, adjust the label but keep the description. From the image, the third option's text is "it results in the swapping of genes on homologous chromosomes".)