Question

Give reason :

➡️ Both gametogenesis and fertilisation collectively maintain the chromosome number constant from generation to generation. ​

Answer 1

gametogenesis and fertilization maintains chromosome number: but actually the type of cell division matters here.

before fertilisation the primary oocyte(ovum) and sperm are results of q meiosis division . here the parent chromosome number is halved in the progeny of it. like if parental cell has 46 chromosomes 5hen progeny will have 46÷2=23 each.

this happens because when the gametes unite there must be half pair of chromosomes in each otherwise the chromosome number will get disturbed.

E.G. HUMANS HAVE 46 CHROMOSOMES.

SO WHEN SPERM OVUM UNITE THEY MUST HAVE 23 EACH SO THAT AFTER UNION THE CHROMOSOME NUMBER BECOMES 46.

had they had 46 each then after union it would have been 46+46= 92 which is not a human...

so the meiotic division before fertilization is important.

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Answer 2

During gametogenesis or fertilization each gamete carries haploid sets of chromosomes (23 pairs). When these gametes fuses, the set of chromosome becomes diploid (46 pairs). Hence, a full set of chromosome is inherited by progeny from the contribution of haploid sets from both the parents.This is how number of chromosomes is maintained from one generation to another.