Mammary glands are modification of

Location and secretion of Leydig cells are

Life expectancy of sperms in the female tract is

Levels of estrogen and progesterone are minimum at the time of

Inability of sperm to fertilize ovum is termed as

In the testis, primary germinal cells undergo mitotic divisions to produce

In telolecithal egg

In Mammals the tests occur in scrotal sacs outside the viscera because of the

Both corpus luteum and macula lutea are

In humans, spermatogenesis takes about