Question

the karyotype of one species of primate has 48 chromosomes. in a particular female, cell division malfunctions, and she produces one of her eggs with an extra chromosome (25). the most probable source of this error would be a mistake in which of the following processes?
○ either anaphase i or ii of meiosis
○ mitosis in her ovary
○ telophase ii of one meiotic event
○ telophase i of one meiotic event

Explanation:

Nondisjunction (the failure of chromosomes to separate properly) during anaphase I or II of meiosis can lead to gametes (eggs in this case) with an abnormal number of chromosomes. Telophase is a stage of cell division where chromosomes de - condense and nuclear envelopes reform, and it is less likely to be the source of an extra chromosome. Mitosis in the ovary would produce somatic - like cells (not gametes with the haploid number of chromosomes adjusted for the species).

Answer:

either anaphase I or II of meiosis