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The idea of 2 sexes is overly simplistic biologists now think there is a larger spectrum than just binary female and male by claire ainsworth & nature magazine gary waters getty images In fact, biological sex is encoded in every cell of the body 2. Introduction there are only two sexes and there can never be more

This is not a matter of cultural convention, social belief, or political preference Man and woman is supported by sources that define sex by gamete production and typical male/female biology, but contemporary scientific and social analyses show important biological variability, intersex conditions, and a clear distinction between sex and gender. Sex is not defined by one’s identity, social role, or even their chromosomes or genitalia

In biological science, sex is defined by the gamete morph an organism produces

Females produce large gametes (eggs/ova) Biological sex is not as simple as male or female defining sex as a binary excludes many biological realities, scientists say Biological sex versus gender identity biological sex and gender identity are distinct concepts, though often used interchangeably Biological sex is a classification assigned at birth based on physical and physiological characteristics, including chromosomes, internal reproductive organs, external genitalia, and hormones.

Here i synthesize evolutionary and developmental evidence to demonstrate that sex is binary (i.e., there are only two sexes) in all anisogamous species and that males and females are defined universally by the type of gamete they have the biological function to produce—not by karyotypes, secondary sexual characteristics, or other correlates. Executive summary the claim there are two sexes

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