Identical vs. Fraternal Twins

[drzakisadiq]

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Can someone explain to me how the two come about, embryonicaly? I know already that fraternal twins come about when a two separate eggs that have been released into the fallopian tube are fertilized, but I need to know the embryology of how identical twins come about, like what does the sperm do or what happens to the egg?

 

[nixon13]

Identical twins arise from indeterminte cleavage. Sorry dont know the exact answer to what you are asking but I thought you should know this info too.

 

[futuredent22]

identical twins are formed from a single egg that splits into two separate organisms. Both twins are from the same sperm and egg, so are genetically identical

 

[Danny289]

Can someone explain to me how the two come about, embryonicaly? I know already that fraternal twins come about when a two separate eggs that have been released into the fallopian tube are fertilized, but I need to know the embryology of how identical twins come about, like what does the sperm do or what happens to the egg?

just know: fraternal twins=========> 2 sperm & 2 egg===> they can be different sex like two different children in family.

identical twins======> 1 sperm & 1 egg ====> gentically same and same sex

 

[Mstoothlady2012]

Humans have inderterminate cleavage so there is a possibility that cleavage occurs and divides the morula (not sure if its morula or something else) and the zygote gets divided in half, which leads to development of 2 different embryo. I think that is where you get identical twins. I have an identical twin😀

 

[DCRedskinsRule]

Humans have inderterminate cleavage so there is a possibility that cleavage occurs and divides the morula (not sure if its morula or something else) and the zygote gets divided in half, which leads to development of 2 different embryo. I think that is where you get identical twins. I have an identical twin😀

I think the division is before the morula when we're just a ball of cells dividing and increasing in density but not size.

 

[Contach]

I think the division is before the morula when we're just a ball of cells dividing and increasing in density but not size.

this stage is the morula... is it not?