Question

Post fertilization nondisjunction refers to?

1) The failure of chromosomes to separate during meiosis
2) The fusion of two sperm cells with one egg cell
3) The failure of the zygote to implant in the uterus
4) The abnormal development of the embryo after fertilization

Answer 1

Nondisjunction refers to the failure of homologous chromosomes to separate during meiosis I or the failure of sister chromatids to separate during meiosis II, resulting in an abnormal chromosome number known as aneuploidy.

Step-by-step explanation:

Nondisjunction is the failure of homologous chromosomes to separate during meiosis I or the failure of sister chromatids to separate during meiosis II, leading to the formation of n+1/n-1/n chromosomes. This abnormal chromosome number is known as aneuploidy. Nondisjunction can result in disorders such as Down syndrome, Turner syndrome, and Klinefelter syndrome