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Wake-up

Wake-up. Cross a heterozygous man for eyebrows with a woman with a unibrow . A unibrow is a recessive trait. What are the chances of them having a child with a unibrow ?. Special Crosses: Incomplete Dominance and Codominance. What is Incomplete Dominance?.

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Wake-up

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  1. Wake-up • Cross a heterozygous man for eyebrows with a woman with a unibrow. A unibrow is a recessive trait. • What are the chances of them having a child with a unibrow?

  2. Special Crosses: Incomplete Dominance and Codominance

  3. What is Incomplete Dominance? • Blending of the dominant and recessive alleles in heterozygous • 3rd phenotype

  4. Plant: Snapdragons White: r Red: R

  5. Pink: Rr

  6. Humans: Hair Type Straight: c Curly: C

  7. Wavy: Cc

  8. In snapdragons, red flowers are dominant over white flowers. The heterozygous genotype has pink flowers. Cross a homozygous red-flowered plant with a pink flowered plant. What are the chances of producing white flowers? (R = red and r = white)

  9. If a yellow guinea pig is crossed with a white one, the offspring are cream-colored. What kinds of offspring are expected if two cream-colored guinea pig mate? (Y = yellow and y = white)

  10. What is Codominance? • Both dominant and recessive alleles are expressed in heterozygous • 3rd phenotype

  11. Chickens: Feather Color White: b Black: B

  12. Black and White: Bb

  13. Cattle: Fur Color Red: R White: r

  14. Roan: Rr

  15. In certain cattle, hair color can be red (homozygous RR), white (homozygous rr), or roan (a mixture of red and white hairs, heterozygous Rr). When a red bull is mated to a white cow, what genotypes and phenotypes of offspring could be obtained?

  16. If one of the offspring found above were mated to a white cow, what genotypes and phenotypes of offspring could be produced? In what proportion?

  17. Class Data: Fingerprints

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