XO, XX, XY, XXY, XYY, XXX, XXXX, XXXY, XXYY, and others have been recorded in humans. In addition there is Swyer syndrome, Chappell syndrome, and mosaicism in which the gonadal phenotype doesn’t match the genotype. There are also events during fertilization which can cause an XX zygote to gain the SRY gene from the father. The SRY gene is what initiates male gonad development.
Sex is not binary just because there are two types of sex chromosomes. They can occur in multiple combinations and result in a spectrum of characteristics.
goldenbug@fedia.io 3 weeks ago
If I remember correctly, not even sex is binary in humans.
Entheon@lemmy.world 3 weeks ago
There are a decent number of combinations of the X and Y chromosomes, not just XX and XY. If I remember correctly there are about 6 more common combos
jol@discuss.tchncs.de 3 weeks ago
Not just cromossomes matter. Intersex can be purely environmental and not genetic.
ICastFist@programming.dev 3 weeks ago
Aren’t those considered disorders, tho? Like XXX or XXY
Nima@leminal.space 3 weeks ago
yes the majority of humans just have one or the other and mutations and disorders can cause variations within the two. but those aren’t a majority of humans.
people seem to think that he is putting some negative meaning behind it.
just because a mutation is a mutation doesn’t mean it’s bad. but it doesn’t mean it’s normal for humans either.
powerstruggle@sh.itjust.works 3 weeks ago
You’re probably thinking of variations within a sex, such as XXY. They still have bodies organized around producing one of two gamete sizes. Nobody produces a third size of gamete
mech@feddit.org 3 weeks ago
But some produce neither.
powerstruggle@sh.itjust.works 3 weeks ago
Nobody has a body organized around producing no gametes