Question

Assertion: Gametic meiosis occurs in the diplohaplontic life cycle.
Reason: The diploid sporophyte forms gametes that undergo meiosis. thereby forming haploid gametes.
A. Both assertion and reason are correct and reason is the correct explanation for assertion.
B. Both assertion and reason are correct but reason is not the correct explanation for assertion.
C. Assertion is correct but the reason is incorrect.
D. Both assertion and reason are incorrect.

Answer 1

The reproductive cells of an organism are called gametes. Sex cells are another name for them. Male gametes are known as sperm, while female gametes are known as ova or egg cells. Gametes are haploid cells with just one copy of each chromosome in each cell.

Complete answer:
The reproductive cycle observed in animals and some protists is known as the gametic life cycle. Gametes are the product of meiosis, and the word gametic applies to them. A reproductive cell develops haploid gametes (sex cells including egg and sperm) that combine to form a zygote during the gametic life cycle.

The zygote develops into a multicellular diploid individual by cell division and cell elongation. The gametes are the only haploid stage of the life cycle in the gametic life cycle. The only haploid cells produced are the gametes (egg and sperm).

In pteridophytes, the diploid stage is multicellular, and haploid gametes are formed; meiosis is gametic, resulting in an independent haploid or gametic generation. To create haploid spores, diploid sporophyte cells go through meiosis. Each spore divides into a multicellular, haploid gametophyte by mitotic divisions. The gamete is generated by mitotic divisions within the gametophyte. The fusion of two gametes produces the diploid sporophyte.

So, If both assertion and reason are true and reason is the correct explanation of assertion. Option (A) is correct.

Note: Meiosis produces four haploid (n) gametes that are genetically distinct from each other and the original parent (germ) cell, while mitosis produces two diploid (2n) somatic cells that are genetically identical to each other and the original parent cell.