Question

Complete the chart to show the daughter cells that would result from each type of non-disjunction.

Answer 1

A. Normal X chromosome segregation: Produces 4 haploid cells.

B. Non-disjunction in Meiosis 1: X chromosome fails to separate in meiosis 1. It produces no copies of this chromosome, while the other contains 2 copies of chromosomes instead of one.

C. Non-disjunction occurs in meiosis 2: In meiosis 1, there is normal segregation of the X chromosome. One of the sister chromatids fails to separate in meiosis 2, producing one cell with two copies of this chromosome while the other does not have. Normal segregation happens in the other cell, producing 2 normal haploid cells.