Question

Occasionally during meiosis. a single homologous chromosome pair may fail to separate. a human gamete produced by such a nondisjunction could have a chromosome number of

Answer 1

Nondisjunction during meiosis can result in an abnormal chromosome number in human gametes. If homologous chromosomes fail to separate, two gametes will lack that chromosome and two gametes will have two copies. If sister chromatids fail to separate, one gamete will lack the chromosome, two gametes will have one copy, and one gamete will have two copies.

Step-by-step explanation:

Nondisjunction can occur during either meiosis I or II, resulting in an abnormal chromosome number in human gametes. If homologous chromosomes fail to separate during meiosis I, two gametes will lack that particular chromosome and two gametes will have two copies of the chromosome. If sister chromatids fail to separate during meiosis II, one gamete will lack that chromosome, two gametes will have one copy of the chromosome, and one gamete will have two copies of the chromosome.

Answer 2

Am certain that a human gamete produced by such a nodisjunction could have a chromosome number of 43. Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division. There are three forms of nondisjunction: Failure of a pair of homologous chromosomes to separate during meiosis I, failure of sister chromatids to separate during meiosis II, and failure of sister chromatids to separate during mitosis.