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NonMendelian Genetics

NonMendelian Genetics. Incomplete Dominance - inheritance pattern in which one allele is not completely dominant over the other allele. Example: RR – red snapdragons WW – white snapdragons RW – . What would happen if you crossed two pink snapdragon flowers?. Incomplete Dominance.

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NonMendelian Genetics

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  1. NonMendelian Genetics

  2. Incomplete Dominance - inheritance pattern in which one allele is not completely dominant over the other allele • Example: RR – red snapdragons WW – white snapdragons RW –

  3. What would happen if you crossed two pink snapdragon flowers?

  4. Incomplete Dominance

  5. Codominance - inheritance pattern where both alleles contribute to the phenotype of the organism • Example: CBCB x CWCW black chicken white chicken

  6. What would the genotypic and phenotypic ratios be if you crossed a black chicken with a black and white speckled chicken?

  7. Multiple Alleles - presence of more than two alleles for a given trait. Safe Transfusions Antigen on Red Blood Cell Phenotype (Blood Type) Genotype From To • Example: human blood type • Gene is written as an I and has three alleles (IA, IB, i) • IA and IB are codominant, i is recessive. Figure 14-4

  8. If a man with type AB blood marries a woman with type O blood, what are the possible genotypes and phenotypes for the children’s blood?

  9. Sex-linked Traits fruit fly eye color XX chromosome - female Xy chromosome - male • Traits controlled by genes on the 23rd pair of chromosomes (sex chromosomes) • MOST sex-linked genes are on the X chromosome • females will have 2 copies of these alleles, males have only 1 • ex - color blindness, hemophilia, male pattern baldness are all recessive sex-linked traits 9

  10. Sex-linked Trait Problem Color-blindness is an X-linked recessive trait. Determine the genotypic and phenotypic ratios of a cross between a woman who is a carrier for color blindness and a man with normal color vision. Show all of your work.

  11. Female Carriers

  12. Polygenictraits - traits controlled by more than one gene. • ex- human skin color and height • these traits usually exist on a continuum

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