Question

Which type of cell division takes place in gonads?
(a)Mitosis only
(b) Meiosis
(c)Both (a) and (b)
(d)Amitosis and meiosis

Answer 1

Hint: Gonads are the primary reproductive gland that produces reproductive cells or gametes. we only need half the amount of genetic material in the germ cells. So there occurs the kind of cell division, which provides a mechanism for the reduction of chromosome number from a diploid to a haploid value.

Complete answer:
In the gonads reductional division or meiosis takes place. This is because it requires only half the amount of genetic material in the germ cells. The two germ cells then combine during fertilization and the amount of genetic material is restored in the zygote. This is done to maintain the chromosome number of a species.
Meiosis is a specialized type of cell division, occurring in diploid reproductive cells of all sexually reproducing organisms. It is often called reduction division. In diploid organisms, it occurs in diploid gametocytic or sporocytic cells during gametogenesis or sporogenesis to produce haploid gametes or spores.

Additional information:
- Gamete-producing meiosis is called gametic, gametogenic, or terminal Meiosis and spore-producing meiosis is called the spirit, sporogenic or intermediate meiosis.
-Gametogenic meiosis is found in many protists, a few lower plants, and in all animals. Sporogenic meiosis occurs in higher plants. -The meiotic cell division or meiosis is a reductional, disjunctional, and heterotypic division. It is a reductional division in the sense that the diploid chromosome complement of the parent cell is reduced to a haploid value in the daughter cells.

So the correct answer is ' Meiosis'

Note:
-The overall meiosis cycle involves a single chromosomal duplication and two successive cell divisions. So four haploid daughter cells would be formed from a diploid parent cell.
-This is in contrast to mitosis. Mitosis involves a single chromosomal duplication and a single cell division.
-It is said to be a disjunctional division, since the companion chromosomes of each homologous pair separate or disjoint from each other.