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Sometimes sexual reproducers have kids that have a mutation that protects them from a given disease—the offspring with the mutation survive to mate and pass it down the generations.
When you produce clones, if one of them doesn’t have the mutation, none of them will, leaving them vulnerable. It's beneficial because it allows creatures to skip the whole fighting-and-possibly-dying-for-the-right-to-mate thing.
But asexual reproducers are simply cloning themselves, so they don’t benefit from this mixing. Species tend to produce more offspring than the environment can support, and the ones that have beneficial variations survive and pass the genes responsible for them down to their kids.
about duck penises—that they’re shaped like corkscrews, and that females have vaginas that corkscrew in the opposite direction. But animal sex gets a whole lot weirder, with sexual dismemberment, servitude, and freaky parasitism that makes the duck’s corkscrew seem practically....straight?
The offspring of any particular couple necessarily vary—consider how much you differ from your siblings.
This is of course because offspring get a random mix of genes from their parents.
(Control over reproduction is great and all, but you still want to be able to propagate the species.) This is part of the reason why sex gets so strange in the animal kingdom: The push and pull between the sexes results in some of evolution’s more creative accomplishments. The male anglerfish, for instance, bites onto a female, fuses to her, and lives the rest of his life as her sperm factory.
This is an evolutionary ploy to ensure that when an anglerfish couple manages to meet in the vast emptiness that is the deep sea, they can be damn sure they get some fertilization happening.