Spermatogenesis and oogenesis are processes of formation of the male and the female gametes as shown below.

Answer the following question, related to gamete formation.

(I) If accidentally the primary oocyte is fertilized with a sperm, the resulting zygote will have how many sets of chromosomes:

(a) n 

(b) 2n 

(c) 3n 

(d) 4n

(II) The middle piece of the sperm contains: 

(a) Mitochondrial DNA only 

(c) Nuclear DNA only

(b) No DNA at all d) Nuclear and mitochondrial DNA both

III) The most plausible reason for the formation of polar bodies during oocyte development is 

(a) to retain large quantity of cytoplasm in the oocyte.

(b) to retain chromosomes in the oocyte.

(c) to retain both chromosomes and cytoplasm in the oocyte.

(d) to retain the egg membrane which is essential for fertilization.

IV) Which one of the following statements is true regarding normal oocyte development? 

(a) Primary oocytes are produced after a female attains puberty (post puberty).

(b) primary oocytes are already produced in the ovary when a girl is born.

(c) Primary oocytes are produced in the ovary just before the female attains puberty (pre puberty).