How many spermatozoa and ova will be formed by 50 primary...

During spermatogenesis, one primary spermatocyte undergoes meiosis to produce four haploid spermatozoa.

Number of spermatozoa produced by $50$ primary spermatocytes $= 50 \times 4 = 200$.

During oogenesis, one primary oocyte undergoes meiosis to produce only one functional ovum and polar bodies.

Number of ova produced by $50$ primary oocytes $= 50 \times 1 = 50$.

Thus, $200$ spermatozoa and $50$ ova will be formed.

Answer: 200 and 50