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21 gru 2022 · Biological sex reflects two distinct evolutionary strategies to produce offspring: the female strategy is to produce few large gametes and the male strategy is to produce many small (and often motile) gametes. This fundamental definition is valid for all sexually reproducing organisms.
23 lut 2022 · Sex differences are relevant to animal models, too. Systematic phenotyping of mice revealed that many physiological and behavioural traits are sexually dimorphic, as are the effects of most ...
5 lip 2022 · So how exactly does biological sex work in the animal kingdom, and how is it defined in nature? Two biologists answer. “Variation” It is true that chickens have two sexes and that there are also animals that change sexes or are both sexes. “There are a bunch of animals that are both, such as earthworms and snails.
Define biological fitness and parental investment, and explain why females are more likely than males to be “choosy” about mates; Define sexual selection, and give examples of secondary sexual characteristics; Describe different ways that males compete for mates
23 paź 2023 · In biology, “male” refers to an individual that makes small sex cells like sperm, and “female” refers to an individual that makes large sex cells like eggs.
31 sty 2018 · Some obvious examples of animals in which females extrude much more calcium from their body related to reproduction than males are birds (eggs with a calcareous shell) and mammals that produce milk, with its extraordinarily huge Ca 2+ -concentration of about 50 millimolar (mM) compared to the very low Ca 2+ -concentration of about 100 nanomolar ...
12 mar 2023 · Specifically, we argue that what it is to be, say, male, is to have a part or process that has the (proximal or distal) biological function of producing sperm. We outline and defend our view, and sketch some implications for scientific and social problems related to sex.
