Quote Originally Posted by AntTheDestroyer View Post
Saying that polyploids in diploid leads to infertility is just plain false. About 50 percent of women with down syndrom are fertile. Even in a case of polyploidy of sex chromosomes, as is the case with Klinefelters syndrome a small percent are fertile for the majority of their life.

You are confusing the process of diploid sexual reproduction in the same species versus that between seperate species where the DNA is not necessarily compatible. You need to look into the difference between polyploid speciation and homoploid speciation. Then please get back to me.

I think I have taken this thread about as far off topic as I can, and it is beginning to seem disrespectful to the OP so I would encourage anyone who would like to continue this line of conversation to pm me.
Down syndrome is not a case of polyploidy though. It is trisomy, a form of aneuploidy.

"The distinction between aneuploidy and polyploidy is that aneuploidy refers to a numerical change in part of the chromosome set, whereas polyploidy refers to a numerical change in the whole set of chromosomes."


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