Question

What are the main diseases caused by errors in the number of sex chromosomes in the cells of an individual?

Answer 1

Ans: The main diseases caused by errors in the number of sex chromosomes in the cells of an individual are:

Klinefelter's Syndrome- this genetic disorder is caused by the presence of an additional copy of X-chromosome resulting into a karyotype of 47 (XXY).

Turner's Syndrome- this disorder is caused due to the absence of one X-chromosome, that is 45 (X0)

Triple X Syndrome (Superfemale) that is 47(XXX) cells; its happening due to errors in maternal meiosis I

XYY Syndrome (Supermale)- it may caused by paternal non-disjunction at meiosis II