I probably just have a really bad grasp on how genetics work, but if human eggs already have an X chromosome plus all the other necessary genes needed to combine with another haploid cell, why can’t 2 eggs just combine with each other to make an XX zygote?
In: Biology
Cells have a cell membrane.
When a cell takes something into it, the something can either get past the cell membrane and go into the cytoplasm, or it can’t.
If it can’t, then the cell kind of engulfs the something, surrounding it in cell membrane. (This is part of why it’s thought that mitochondria was a bacteria that was engulfed into a primordial cell.)
So since both eggs have a cell membrane, one couldn’t just enter into another one by going though it. It could theoretically be engulfed, where the inner cell is now surrounded by a second layer of membrane and making them into a massive cell with twice as much stuff. But either way, the DNA in the nucleus wouldn’t be able to reach the DNA in the other nucleus, and therefore they wouldn’t merge into an XX female zygote
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