Question

In humans, what is the ratio of the number of gametes produced from one male primary sex cell to the number of gametes produced from one female primary sex cell?
(A) 1:1
(B) 1:3
(C) 1:4
(D) 4:1

Answer 1

Hint: The number of spermatozoa produced is four times the number of oocytes produced by humans during their puberty. Sex cells are also known as gametes and they are the reproductive cells.

Complete answer:
In humans, From a diploid, primary spermatocyte, four haploid spermatozoa are produced through meiosis. From a diploid primary oocyte, just one haploid ovum is made. The remaining are polar bodies. These polar bodies don't develop as ovum or ovum.

From a diploid, primary spermatocyte, four haploid spermatozoa are produced through meiosis. From a diploid primary oocyte, just one haploid ovum is made. The remaining are polar bodies. These polar bodies don't develop as an ovum. The ratio of the number of gametes produced from one male primary sex cell to the number of gametes produced from one female primary sex cell is 4:1.

Additional Information: Gametes are haploid cells, and every cell carries just one copy of every chromosome. These reproductive cells are produced through a kind of cellular division called meiosis. During meiosis, a diploid parent cell, which has two copies of every chromosome, undergoes one round of DNA replication followed by two separate cycles of nuclear division to supply four haploid cells. These cells become sperm or ova. The ova mature within the ovaries of females, and therefore the sperm develop within the testes of males. Each sperm, or spermatozoon, is little and motile. The spermatozoon features a flagellum, which may be a tail-shaped structure that permits the cell to propel and move. In contrast, each ovum, or ovum, is comparatively large and non-motile. During fertilization, a spermatozoon and ovum unite to make a replacement diploid organism.
So, the correct answer is ‘(d) 4:1’.

Note: Meiosis is a process where one cell divides twice to produce four cells containing half the initial amount of genetic information. The cells which undergo meiosis are our sex cells – sperm in males, eggs in females.