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ignis389 t1_j0unw75 wrote

So if i have a shirt with male birds on it, is it a ZZ Top?

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Landlubber77 t1_j0uwbx2 wrote

Whereas sex with birds is determined by whether they're sleeping or not when I sneak up on them.

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tossinthisshit1 t1_j0vvnsu wrote

> In contrast to the XY sex-determination system and the X0 sex-determination system, where the sperm determines the sex, in the ZW system, the ovum (egg) determines the sex of the offspring.

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DumbbellDiva92 t1_j0uwlwb wrote

Is there a Z-inactivation gene in male birds the same way there is X-inactivation in female mammals?

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isaacyall t1_j0vwo3e wrote

Intriguing. Thanks for sharing that!

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Pseudonymico t1_j0xtrn1 wrote

Conservatives absolutely fuming right now

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Xploited_HnterGather t1_j0uv23u wrote

Fasincating; you know how human females are (XX) and males (XY)? You also know how all humans are first female and then if you have the Y your body starts changing into male?

I have always seen the above two facts as meaning that in a real sense we are a female species that has male variants. I wonder if birds start out in their eggs as male and then differentiate into females if they have the W chromosome.

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marmorset t1_j0w7jpa wrote

That's not how it works. There's a default human form with shared characteristics but the embryo is created either XX or XY. Right from the beginning these genes start to direct development, that's why even at an early age male and female children have differences even though their bodies are very similar.

The fact that men have nipples is often used as proof of a female template, but that's just a shared characteristic. Humans start with the same set up and then the basic form is developed as necessary. The same argument about nipples could be made for hips and knees. The human template is obviously male because males have similar hips and knees their whole lives, but women's hips and knees change profoundly during puberty. That doesn't mean we're a male species, just that having "male" hips and kness doesn't hinder a woman and having "female" nipples doesn't hinder a man.

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u/treeofliife

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ZhouDa t1_j0wc5f8 wrote

Wait, how are a woman's knees different than a man's knees?

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treeofliife OP t1_j0v1tsd wrote

Wow didn't know that. How did you see it in real time?

Sequencial hermaphroditism is also pretty interesting.

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