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

Question

Quizplus · Accepted Answer

Crossing-over during prophase I of meiosis introduces new combinations of alleles within chromosomes, and independent assortment during metaphase I allows for the random distribution of maternal and paternal chromosomes to the gametes, both contributing significantly to genetic variability.

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