Non-identical twins can be both boys girls or boy and girl why?

You're absolutely right! Non-identical twins, also known as fraternal twins, can be any combination of genders:

* Boy and Girl: This is the most common scenario, occurring when two separate eggs are fertilized by two different sperm.

* Two Boys: This happens when two eggs are fertilized by two sperm, both carrying the Y chromosome (determining male sex).

* Two Girls: This happens when two eggs are fertilized by two sperm, both carrying the X chromosome (determining female sex).

Here's why:

* Non-identical twins develop from two separate eggs: Unlike identical twins, who develop from a single fertilized egg splitting, non-identical twins have their own distinct genetic makeup.

* Each egg is fertilized independently: Each egg has the potential to be fertilized by a sperm carrying either an X or Y chromosome. This means the gender of each twin is determined independently of the other.

In short, non-identical twins are like any other siblings, with the same chance of being a boy or a girl.

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