Question

how does this crossing over of chromosomes affect the traits of offspring?
a. it causes more similarity in the traits of offspring.
b. it causes more variation in the traits of offspring.
c. it causes more mutations in the traits of offspring.
d. it causes more dominance in the traits of offspring.

Explanation:

Crossing over during meiosis leads to the exchange of genetic material between homologous chromosomes. This results in new combinations of alleles in gametes. When gametes fuse during fertilization, the offspring inherit these new combinations. Variation in traits is increased because of the new allele combinations, not similarity (A is wrong). Mutations (C) are random changes in DNA sequence, not directly caused by crossing over. Dominance (D) is about allele expression patterns (e.g., dominant - recessive relationships) and not related to crossing over's effect on trait variation.

Answer:

B. It causes more variation in the traits of offspring.