Do human female eggs have yolks?
Yes, because like in any other female animal, the yolk in the source of first ”food” for the developing foetus. These yolk spots in the fertilised ovum are present for a short period of time until the placenta (umbilical cord) forms, in humans. The food that the foetus needs is NOT stored in the nucleus because that’s where all the genetic material, the DNA, is fusing. Also, the food is not stored in the cytoplasm because this is where the vital chemical reactions are taking place like the production of hormones that’s going to keep it alive. NB. These yolk spots only become present when the egg has been fertilised.