Explain the simultaneous origin of Turner Syndrome and color blindness by the abnormal behavior of chromosomes at meiosis?

Answer 1

Meiotic non-disjunction is used to describe abnormal behavior of sex chromosomes during meiosis although the cause may be non-conjunction or failure of pairing rather than failure of separation of chromosomes or chromatids.

The child only has one X chromosome. So the mother must be X+X- and the father is just X+Y. So the child is X- , with the X- from the mom and nothing from dad.

B.

Yes it can. Non-disjunction n-1 gamete fertilized an egg from mom with the mutant X chromosome. She has the mutant allele from her mother and the non-disjunction came from her father because of the n-1 rule.

C.

You cannot distinguish whether the abnormal chromosome behavior occurred at the first or second division of meiosis. The reason for this is because with non-disjunction meiosis both parts give you the n-1 rule. So, you cannot tell if it occurred during meiosis I or meiosis II.

Answer 2

In Turner Syndrome, a female is born with one missing or partially missing X chromosome, which can lead to physical and developmental issues. Color blindness, on the other hand, is a genetic condition caused by mutations on the X chromosome affecting the ability to perceive certain colors. Abnormal behavior of chromosomes during meiosis, such as non-disjunction or genetic mutations, can result in these conditions occurring simultaneously in an individual due to errors in chromosome segregation or genetic inheritance.