Question

The table above shows five different types of chromosomal abnormalities that can occur during meiosis. They result in either an individual having too many or too few chromosomes in their genome. What is the most likely cause of these chromosomal abnormalities?

Answer 1

D) nondisjunction of chromosomes

Step-by-step explanation:

nondisjunction of chromosomes During both mitosis and meiosis, chromosomes line up and separate during metaphase and anaphase, respectively. If the homologous chromosomes fail to separate, a nondisjunction mutation can occur. This nondisjunction can result in too many or too few chromosomes in the new cell.

Answer 2

The correct answer would be nondisjunction.

Nondisjunction refers to the failure or improper division of chromosomes during a cell division.

It can occur in meiosis I, meiosis II as well as in mitosis.

In anaphase I of meiosis I nondisjunction results in improper segregation of homologous chromosomes due to which one cell gets two copies of the chromosome and other cell does not get a single copy of that chromosome.

Similarly, in anaphase II, the sister chromatids are improperly divided due to nondisjunction. It results in a situation in which one daughter cell posses an extra copy of the chromosome while the daughter cell lacks that chromosome.

For example, in Down syndrome trisomy of chromosome 21 occurs due to nondisjunction.