Barr body in mammals represents
All the heterochromatin in female cells
One of the two $X$ chromosomes in somatic cells of females
All the heterochromatin in male and female cells
The $Y$ chromosome in somatic cells of male
Alleles which show independent effect are called
The mule is a
Meta-females have
Albinism is known to be due to an autosomal recessive mutation. The first child of a couple with normal skin pigmentation was an albino. What is the probability that their second child will also be an albino
Improvement of genetic characters and present day generation on the basis of best nutrition and training is called