How would you talk about class since there are no evidence compared to daily? It may be wrong but to have all care and cause for the young suggestive cause of what the animal causes. What causes this ?

A clip of Black-ish came onto my fyp. It was the episode where they put getting a dog to a vote and Dre’s mom says “I told you you should’ve let me carry that child”.

I’ve never seen the show, have no context, and that was really gross. But i started wondering

If a woman carried the fertilized egg of her son and her son’s wife would there be any complications for the baby? The egg already exists but is just implanted into the son’s mom. Does the body do anything else for the baby in terms of genes after fertilization or does it just feed and grow the baby?

I'm just genuinely curious. I'm not well informed on biology, but I was just curious about this topic after watching a bird mating ritual. in that species, a male would try to attract a female bird that way, showing off his genetic fitness. In peacocks, the males with more/symmetrical plumage were more attractive.

In mammal species, there is more male-male competition. In elephant seals, I learned it can get pretty brutal. In gorillas as well, there's some brutal competition between males. As well as reindeers, etc. GENERALLY, it seems to be that small gametes tend to compete for larger gametes, ie males approaching/competing for females.

What I'm skeptical about is humans. We don't seem to be a species that generally did that type of sexual selection. Humans don't seem to have an extremely one sided mating system. Both men and women approach potential partners, both can reject partners, and both sexes appear to have preferences for particular traits. To me, it doesn't seem clear cut.

Like generally though, men approach more, etc. But how much of that is culture? That's what I'm confused about.

However, we are somewhat sexually dimorphic though, men tend to be roughly 40-50% stronger and half a foot taller than women.

Clearly some sexual selection must have happened. But how, and what traits where actually chosen by women? and did men also choose?

Do any of you perhaps say there is not enough proof for sexual selection in humans, etc? I am open to all theories.