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Deducing Genotypes Song Hee Bae IB1 Biology. Pedigree Charts How a trait can pass Whether dominant or recessive Whether sex-linked or not Sex-linkage.

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Presentation on theme: "Deducing Genotypes Song Hee Bae IB1 Biology. Pedigree Charts How a trait can pass Whether dominant or recessive Whether sex-linked or not Sex-linkage."— Presentation transcript:

1 Deducing Genotypes Song Hee Bae IB1 Biology

2 Pedigree Charts How a trait can pass Whether dominant or recessive Whether sex-linked or not Sex-linkage oEx) color blindness, hemophilia Similar to family tree Squares = male Circles = female Shaded = affected Not shaded = unaffected

3 Huntingtons Disease Whether mothers genotype is Hh or HH Consider genotypes of next generation Affected people oFirst daughter oForth son oFifth son Unaffected people oSecond and third sons oGrand daughter Mother must be Hh

4 Using Test Crosses To distinguish between Dominant X Dominant / Dominant X Recessive A subject is crossed with homozygous ww W W W w ww ww Ww ww Ww W – long ears w – short ears

5 Vocabulary Pedigree chart: diagram which are constructed to show biological relationships. Sex linkage: any genetic trait whose allele has its locus on the X chromosome. Test cross: a method to distinguish whether the individuals that might have the same phenotype are influenced by dominant / recessive allele. Reference IB Study guides page 29 Pearson Biology SL page 105, 108~109


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