Turner syndrome xo females slightly physically

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Turner syndrome - XO females slightly physically abnormal, sterile, mentally normal ii. Super-females - XXX iii. Klinefelter syndrome – XXY males long limbs and sterility c. Some XY people are physically women but missing part of Y d. Some men are XX but have small part of Y on another chromosome X. Y chromosome a. SRY – sex-determining region on the Y chromosome b. Encodes for protein in primary sex determination (types of gametes to be produced) i. Sperm in testes c. DAX1 – on X = anti-testis factor d. SRY to inhibit maleness inhibitor encoded by DAX1 e. Secondary sex development – physical development i. Determined by genes on autosomes and X 1. Control hormones (testosterone and estrogen) XI.X chromosome a. Lots of genes present
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b. Women always have 2 copies c. Men have 1 copy ( hemizygous ) d. Red-green color blindness i. Women must have 2 recessive alleles on each X ii. Men only need 1 recessive allele on X iii. Can skip a gene if father passes it onto his daughter XII. Other Cells with Genetic Material a. Polypoid because many mitochondria in one cell b. Mitochondria i. 37 genes ii. Inherited only from mother because only nucleus comes from sperm c. Chloroplast
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