The four haploid nuclei found at the end of meiosis differ from one another in their exact genetic composition.Some of this difference is the result of
A) cytokinesis.
B) replication of DNA during the S phase.
C) separation of sister chromatids at anaphase II.
D) spindle formation.
E) crossing over during prophase I.

Question

Quizplus · Accepted Answer

Crossing over during prophase I of meiosis results in exchange of genetic material between homologous chromosomes, leading to new combinations of alleles in the four haploid nuclei produced at the end of meiosis. The other options (cytokinesis, replication of DNA, separation of sister chromatids, spindle formation) do not directly contribute to genetic variation among the haploid nuclei.

The Four Haploid Nuclei Found at the End of Meiosis