A) maintaining constancy in the number of chromosomes in an organism
B) production of genetic variability in the population of species
C) Reduction of the diploid number of chromosomes to haploid
D) All of the above
Correct Answer: D
Solution :
The main significance of meiosis is [a] The four cells (or gametes) formed as a result of meiosis have got half (of the diploid = vegetative cell) the number of chromosomes. It is essential for sexual reproduction because in this reproduction zygote is formed by fusion of one male and the female gamete. The zygote gives rise to new diploid body. [b] During meiosis-I, although the number of chromosomes are reduced to half but at diplotene stage, crossing over takes place due to which there is a qualitative change as a result to which recombinants are formed.
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