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Repro 2 SG - Repro Study Guide II*sex chromosome makeup of...

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Repro Study Guide II *sex chromosome makeup of male mammals is XY *sex chromosome makeup of female mammals is XX *Sex chromosomes- the X and Y chromosomes, which determine the sex of an individual. *Autosomes- any chromosome except the sex chromosomes. Genes on the autosomes are inherited without regard to the sex of the individual. *Homologous Chromosomes- pertaining to two chromosomes with identical structures and gene loci but not necessarily identical alleles; each member of the pair is inherited from a different parent. Embryonic Structures associated with reproductive development Gonadal ridge – develops into gonad Mesonephros – early embryonic kidney Mesonephric duct – develops into male duct work Paramesonephric duct – develops into female duct work Kidney Cloaca **Be able to Identify the parts of the early embryo (diagram in repro II lecture)** *Default sexual development in mammals is selected for the female. The female organs develop by default because of the absence of the Y chromosome (and testes). *Stimulation results in male organ development; the prescence of the Y chromosome (and testes).
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