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Learn vocabulary, terms, and more with flashcards, games, and other study tools. Humans have 23 pairs of chromosomes, the last of which is the sex-determining chromosome - females have 2 x chromosomes (look normal) - males have one x and one y (the y chromosome can be seen as much smaller than the x chromosome, which we believe allows.). - sex is determined by x chromosome ratio to autosomes - 11 ratio female. Sex determination in humans - at least 1 x chromosome needed for development.   human body cells have 23 pairs of chromosomes in the nucleus. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Sex is determined by the presence or absence of certain chromosomes, and it differs between humans (mammals) and other members of the animal kingdom. Sexual differentiation in humans is the process of development of sex differences in humans. It is defined as the development of phenotypic structures consequent to the action of hormones produced following gonadal determination. Sexual differentiation includes development of different genitalia and the internal genital tracts and body hair plays a role in gender identification. A sex-determination system is a biological system that determines the development of sexual characteristics in an organism. Most organisms that create their offspring using sexual reproduction have two sexes. Occasionally, there are hermaphrodites in place of one or both sexes. There are also some species that are only one sex due to parthenogenesis, the act of a female reproducing without. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Females have two x chromosomes (one is inactive) and males have an xy. There is a region on the y chromosome called thr sry which contains the gene which triggers embryonic development as a male.

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