NEET BIOLOGY

Detailed explanation-1: -Not all twins are identical, of course. More often than not, twins are born with unique physical characteristics. Nonidentical twins are generally known as fraternal twins.

Detailed explanation-2: -Sometimes a fertilised egg splits within a few days of conception to produce genetically identical twins. Because these twins come from one zygote, they’re also known as monozygotic.

Detailed explanation-3: -Identical twins are completely random. It’s not based on family history or genetics. Identical twins form when a single fertilized egg splits and forms two embryos. Now in this case, it’s not because of mom or dad.

Detailed explanation-4: -The answer has to do with the fact that each parent actually has two different sets of genes. And that each parent passes only half of their genes to their child. And that the half that gets passed down is random. All of this together ensures that each child ends up with a different, unique set of genes.