Determine the ploidy of the following cells: Ovum,Sperm,Zygote.

If a germ cell in a female gonad and a germ cell in a male gonad begin undergoing meiosis simultaneously,what will be the ratio of ova and sperms produced?

Which of the following observations does $NOT$ provide evidence that the pattern of cleavage is determined by factors in the egg cytoplasm rather than by the genes of the zygote?

In the ovary,estrogen is secreted by . . . . . . .

What is the process of transformation of spermatids into spermatozoa called?

In the given diagram of human sperm,identify the functions of the labelled parts $A$,$B$ and $C$.