My impression is that genetic information in eggs and sperm are consistent per individual. If so, what causes the combination of those two sources to vary so greatly? Some brothers or sisters are total opposites of each other despite the same “ingredients”. How does that happen genetically? Why would only one of a couples children inherit an expressive genetic disease? Etc.
In: Biology
>My impression is that genetic information in eggs and sperm are consistent per individual.
This is the part that’s wrong. Each egg and each sperm has half of the parent’s DNA, but which half is actually present in a given cell is random. Whether the sperm carries an X or Y chromosome is only one of many factors that randomly varies between sex cells.
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