I want to be very clear, I am not saying that there is anything wrong with people with Down syndrome having or raising children. I am confused because I learn in high school biology that animals like mules cannot reproduce because of their odd number of chromosomes so why is this not true for humans with an odd number of chromosomes?
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Well actually, it is true in humans as well. No living human has an odd number of chromosomes, such a condition is 100% fatal. Instead, we have individuals (such as those with Downs) that have a partial trisomy, meaning they have a piece of one extra chromosome, not an entire extra chromosome.
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