VUBio110BSp'08-ChrTheoryInherit-SexRelatedInherit-Linkage-POST

VUBio110BSp'08-ChrTheoryInherit-SexRelatedInherit-Linkage-POST

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Unformatted text preview: Alternate hypotheses for sex determination • XX XY – #X’s determines gender? – Presence or absence of Y determines gender? • Other modes of sex determination Sex determination (environmental) Reptiles The X and Y chromosomes How did the Y become reduced to this? Genes on the Y chromosome determine “maleness” http://fig.cox.miami.edu/~cmallery/150/mendel/Ychromosome.sm2.gif Fruitfly Karyotype Homogametic for sex chromosome Heterogametic for sex chromosome Work in the “fly room” T.H. Morgan and fruit flies Early evidence of sex-linked inheritance • Females = homozygous • Males = hemizygous • Females = homogametic • Males = heterogametic • Females can be heterozygous Males still hemizygous X-linked or Sex-linked traits are inherited differently in males and females Mothers pass traits to sons Fathers pass trait to daughters Females can be “carriers” Carrier mother, normal father 50% chance sons affected Females can inherit trait, but much more rarely than sons •...
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VUBio110BSp'08-ChrTheoryInherit-SexRelatedInherit-Linkage-POST

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