how are identical twins and fraternal twins develop?

Answer 1

Fraternal twins occur when two eggs are fertilized. That is why fraternal twins often look nothing alike. They look like siblings but not like twins. This is often where you get twins that are a boy and a girl. I know a set of fraternal twins the girl has blue eyes and red hair the boy has brown hair and brown eyes. One looks like the dad and one looks like the mom.

Identical twins occur when the egg after fertilization splits into two halves. From this point on each half of the egg multiplies and divides until there are two identical embyos. These two babies will look very similar, sometimes identical.

Answer 2

Identical twins are split from the same egg. Fraternal twins are when 2 separte eggs are entered by 2 different sperms and they both survive the trip to the womb.

Answer 3

Fraternal twins are the result of two eggs being fertilized at the same time. That's why they don't necessarily look alike, and can be different sexes, since they're from both different eggs and sperm, just both are carried at the same time. Identical twins happen when just one egg is fertilized, but when it splits into two halves, the two halves split apart instead of staying together. That's why they have the same DNA and characteristics--they both came from the same egg and sperm.

Answer 4

identical twins and fraternal twins developed from the very start of the mating process.. 2 sperm cells entered and merged with the egg cell and suddenly 2 babies will come to birth...
And I think that having children that are twins are hereditary...
if you have a twin, more likely your grand child will be twins...
It should only happen with 2 generation intervals...

Answer 5

Identical twins is One egg split into by 2 sperm the other (fraternal) is two eggs by two sperm.