Today is Ask An Atheist Day.

[LostOne4Ever]

51. Fallacy

There are 23 chromosomal pairs. The difference between men and women is that women are XX and Men are XY on the 23 pair.

So the difference between a man and a woman is 1 in 46 chromosomes.

100%*(1-(1/46))=97.8%

So assuming that the X and Y chromosomes are 100% completely different (and they aren't) it would be a 97.8% difference max. Its probably around a 1% difference on average. If we are talking women with CAIS its even smaller as its the difference in one gene.

Also, the definition of species is not so cut and dry. The definition that I remember best from my college bio classes (because it was the simplest) is that organisms become different species when their genes are so different that they can no longer produce a non-sterile offspring if you breed them together.

For instance, combining a horse and donkey to get a mule. Interestingly, humans and chimps are much closer relatives than horses and donkeys yet can not produce an offspring at all. So genetic difference does not exactly equate to new species. However, this definition also has problems in that it does not take into consideration asexual species like jellyfish.

So your fallacy is two fold. One you have the wrong percentage for females, and two the definition of species is not defined well enough for the statement on species to be true.