Which aspect(s) of chromosome behavior is/are primarily responsible for the tremendous amount of genetic variability associated with sexual reproduction?
A)Segregation of sister chromatids at anaphase II of meiosis
B)Segregation of homologous chromosomes at anaphase I of meiosis
C)Crossing over between homologous chromosomes during prophase I of meiosis
D)Independent alignment of different homologous pairs on the metaphase I spindle
E)Both crossing over between homologous chromosomes during prophase I of meiosis and independent alignment of different homologous pairs on the metaphase I spindle contribute to genetic variability

Question

Quizplus · Accepted Answer

Both crossing over between homologous chromosomes during prophase I of meiosis and independent alignment of different homologous pairs on the metaphase I spindle contribute to genetic variability. Crossing over during prophase I of meiosis allows for exchange of genetic material between homologous chromosomes, while independent assortment during metaphase I allows for any combination of chromosomes to end up in a gamete. Together, these two factors lead to an immense amount of genetic diversity during sexual reproduction.

Which Aspect(s) of Chromosome Behavior Is/are Primarily Responsible for the Tremendous