Sexual reproduction

[biology_is_power]

How come there are no two products of sexual reproduction that are identical? (except for identical twins which are rare)

[canalon]

Hint: meiosis

[2810712]

The possible types of chromosomal combinations resulted from a fertilization/syngamy without considering crossing over are equal to the n'th power of 4 [ n is the no. homologous chromosome pairs in a diploid cell]
For humans it is 4 raised to the power 23 multiplied by and...as it is so large generally for most of the sexual reproduction [ also consider the crossing overs and mutations] the probability of getting the same combo is very less.

hrushikesh

[biology_is_power]

ohh i see. so the chances are extremely less. thanks