From the comments: As a genetic scientist, the science on this video is very much correct. My only criticism is the fact that all the variations in chromosomal sex mentioned in this video are all considered to be abnormalities. And unfortunately, the vast majority of the conditions mentioned all lead to infertility in the individuals with these genetic conditions. And infertility means end of that genetic line. If reproduction is not possible with "one sex", then that is not a "sex". |