Why are some mutations, like additional limbs or more than 50 chromosomes, are just not possible for humans to have?
In: Biology
In addition to what others have said about needing multiple mutations, the body has an aggressive failsafe against big changes occurring to the genes. If the body detects that it’s carrying a child with too many or not enough chromosomes, the child is aborted rather quickly. There are some exceptions where small chromosomes or the sex chromosomes are duplicated, but normally everything proceeds normally.
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