Give two reasons for the appearance of variations among the progeny formed by sexual reproduction .
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There are many types of reproduction procedures in our biological ecosystem.
But the evolved and higher class species mainly performs the sexual reproduction,due to many biological benefits.
Variations among every progeny is one of those biological benefits,the main reasons of this variation are:
1)Sexual reproduction depends on two seperate gametes,one male and one female.And these gametes carry random series of biological characteristics data,and the combination of these gametes which is also known as the fertilization.During this fertilization there are infinite possibilities of the mixture among various biological characteristics in the newly formed zygote.
2)In a single sexual reproduction a lot of male gamets are excreted in the female reproductive system,and among those huge number of male gamets only one random male gamet becomes successful to fertilize the ovum,that's why the chances of variation in the next progeny increase a lot.