Adifference between spermatogenesis and oogenesis is:
a. oogenesis is completed prior to fertilization and spermatogenesis is completed after fertilization.
b. oogenesis continues from puberty until death while spermatogenesis occurs from birth until death.
c. each primary spermatocyte produces 4 gametes while each primary oocyte produces one gamete.
d. spermatogenesis uses the process of meiosis and oogenesis uses the process of mitosis.

c. each primary spermatocyte produces 4 gametes while each primary oocyte produces one gamete.

Explanation:

The primary spermatocytes are the diploid cells that enter the process of meiosis during spermatogenesis. Meiosis-I in one primary spermatocyte produces two haploid secondary spermatocytes. Both of these secondary spermatocytes enter the second meiotic division and form a total of four spermatids.

On the other hand, the primary oocyte enters the process of oogenesis and gives rise to one secondary oocyte and a first polar body. Both of them are haploid. Meiosis-II in the secondary oocyte forms an egg cell and second polar body. Therefore, only one female gamete is produced by one primary oocyte.

Mature ovum is being produced in oogenesis, while spermatogenesis has four mature sperms that contains enzymes due to that the sperm is able to penetrate an egg

Explanation:

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

b is the best answer for this question.