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What determines sexThe Y chromosome: Zhao, Ph. NIH M. Partnership Training Program Scholar The human genome is organized into 23 pairs of chromosomes 22 pairs of autosomes and one pair of sex chromosomes , with each parent contributing one chromosome per pair. The X and Y chromosomes , also known as the sex chromosomes , determine the biological sex of an individual: The presence or absence of the Y chromosome is critical because it contains the genes necessary to override the biological default - female development - and cause the development of the male reproductive system.Sex is determined by the presence or absence of certain chromosomes, and it differs between humans (mammals) and other members of the. Environmental theories of sex determination, such as Aristotle's, were popular until about , when sex chromosomes were discovered. As it turns out. The X and Y chromosomes, also known as the sex chromosomes, determine the biological sex of an individual: females inherit an X...the end of the story look at the video above ↑ ↑ ↑

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