A) All the heterochromatin in female cells
B) Y- chromosomes in somatic cells of male
C) All heterochromatin in male and female cells
D) One of the two X - chromosomes in somatic cells of females
Correct Answer: D
Solution :
[d] Sex chromatin body was discovered by the Canadian geneticists Murray L, Barr and E G Bertram (1949). Barr body is a highly condensed structure lies against the nuclear membrane of the inter phase cells of females. According to the British geneticist Mary Lyon (1961), one of the two X-chromosomes of a normal female becomes heterochromatic and appears as Barr body.
You need to login to perform this action.
You will be redirected in
3 sec
