Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child ?
Two $X$ chromosomes
Only one $Y$ chromosome
Only one $X$ chromosome
One $X$ and one $Y$ chromosome
Normally $DNA$ molecule has $A-T, G-C$ pairing. However, these bases can exist in alternative valency status, owing to rearrangements called
Albinism is a congenital disorder resulting from the lack of the enzyme
A hereditary disease which is never passed on from father to son is
Sex-linked characters are
When an allele fails to explain itself in presence of the other allele, the former is said to be