A couple has a son with XYY syndrome, a condition in which an extra copy of the Y chromosome is present. This condition also res
ults from nondisjunction. During which meiotic division, and in which parent, could nondisjunction have occurred to produce a child with this condition?Select all that apply. a. Meiosis I in the mother b. Meiosis II in the mother c. Meiosis I in the father d. Meiosis II in the father
Since the son has two extra Y chromosomes, the nondisjunction would have occurred in father because females do not have Y chromosome. Before Meiosis DNA replication occurs during which the homologous chromosomes are replicated. During Meiosis I crossing over occurs and homologous chromosomes separate from each other. During Meiosis II sister chromatids of a chromosome separate and move into individual daughter cells.
Here, during Meiosis II the sister chromatids of Y chromosome did not separate from each other (nondisjunction). They collectively moved to one daughter cell. As a result one daughter cell had two Y chromosomes and other daughter cell had none. When the daughter cell containing two Y chromosomes combined with the daughter cell containing one X chromosome from mother, XYY individual was born.
Boxer believed it was his (their fault) that the slaughter took place. Napoleon is always right and he will work harder. ... He was the strongest animal.
