A hereditary disease which is never passed on from father to son is
$X$ - chromosomal linked disease
Autosomal linked disease
$Y-$ chromosomal linked disease
None of the above
The traits controlled by the genes located on $X$ chromosome of human beings are said to be
Mule is an offspring of
When two unrelated individuals or lines are crossed, the performance of $F_1$ hybrid is often superior to both its parents. This phenomenon is called
Chromosome theory of sex determination was propounded by
A black hybrid mouse is crossed with a pure brown mouse to produce a total of $24$ young ones. Which of the following result is most likely to be correct