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As stated here the first sexual reproduction seems to be isogamy, which's purpose was likely to repair the DNA, as a damaged cell could repair its' (DNA) strands via recombination with a "healthy" one. As for lineages, the only thing I could find was also in this book at the very beginning, but there doesn't seem to be a difference as for which is the most ...


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In general, It's pretty much the reproductive cells with plants and animals. The male's unique cells (sperm, pollen) fertilizes the female's unique cells (egg, ovule). The resulting offspring develops and hatches from within the female's egg/ovule. Now whether that egg/ovule stays put, gets ejected, hides in a flower, or transferred to the male (like your ...


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Sexes (male and female) are generally defined in terms of Anisogamy, which means that there are size differences between the gametes (i.e. the reproductive cells that fuse at fertilization). The sex with smaller gametes is defined as male and the sex with larger gametes is defined as female (individuals that can produce both types of gametes are called ...


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Like with the rat monogamous pair bond study a similar experiment was done with monogamous Prarie voles where they found similar results. Women naturally Have more neurological receptors in their brains for oxytocin. The rise in oxytocin comes from blood level measurements so when people say oxytocin rises through orgasm they mean it rises in the blood ...



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