Question

20.
Define the term variation. Why is variation beneficial to a species ? List
two reasons for the appearance of variations among the progeny formed
by sexual reproduction.​

Answer 1

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The differences in characteristics between individuals of the same species is called variation.

Variations are beneficial for the survival of the species.

Variation occurs in the progeny formed through sexual reproduction because in this process both the germ cells are equally involved. Reproduction involves fusion of male and female gametes. So, each time when zygote is formed, it is formed by combining of variants.

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