Question

There are several genetic disorders that occur in many organisms where the chromosomes do not sperate properly in meiosis which cause the gametes to have an abnormal number of chromesomes which of the following is the stage where this would occur

Answer 1

Anaphase 2 is the correct answer.

Answer 2

Answer:

This would occur in Anaphase II.

Explanation:

Anaphase II, in meiosis, is a process very similar to anaphase of mitosis, where the separation of sister chromatids from duplicated chromosomes occurs. That is, it is at this stage that the chromosomes are separated.

If the gamete that participates in the fertilization has received one more or less chromosome from an error of this separation, the embryo formed may suffer from some disease, as is the case of Down Syndrome. In this disease, the carrier has 3 chromosomes number 21 instead of just 2, one from the father and one from the mother. The third chromosome is the result of chromosomal non-separation of pair number 21 when gametes are produced.

Non-separation can also occur on sex chromosomes. A girl who receives an extra X chromosome will have the 44A, XXX (triple X syndrome) karyotype, which will result in mental problems, for example. A boy may have two Y sex chromosomes, for example, and have the 44A karyotype, XYY (double Y).