GEN-3000 Study Guide - Midterm Guide: Heterogametic Sex, Pseudoautosomal Region, Y Chromosome
21 Oct 2020
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5. 1 x and y chromosomes were first linked to sex determination early in the twentieth. Century: heterogametic sex - produces gametes containing unlike sex chromosomes (ex. Xy: homogemateic sex - produces gametes containing like sex chromosomes (ex xx, male is not always the heterogametic sex, ex zz male / zw female in birds, butterflies, moths. 5. 2 the y chromosome determines maleness in humans: of the 23 pair chromosomes, one pair is varied in configuration in males and females: Males have one x chromosome and one y chromosome (xy): klinefelter and turner syndromes, both occur due to nondisjunction during meiosis (failure of sex chromosomes to segregate, klinefelter syndrome: Individuals have more than one x chromosome (xxy + 44 autosomes . 47, xxy karyotype: characteristics: tall with long arms and legs, large hands and feet; testes fail to produce sperm, breasts enlarged and hips rounded. Role of y: y chromosome is sufficient to determine maleness: turner syndrome.
