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List the phenotypic and genotypic ratios of the offspring

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1. In some chickens, the gene for feather color is controlled by codominance. The allele for black is CB and the allele for white is CW. The heterozygous phenotype is known as erminette (black and white spotted).

  • What is the genotype for black chickens?
  • What is the genotype for white chickens?
  • What is the genotype for erminette chickens?

Two erminette chickens were crossed. Show the Punnett square. List the phenotypic and genotypic ratios of the offspring.

2. A black chicken and a white chicken are crossed. Show the Punnett Square. What is the probability that they will have erminette chicks?

3. Marcus has blood type AB. His wife Christina is homozygous type A?  They have three children - Millie is type A, Kris is type B and Annabelle is type AB. Does Marcus have reason to worry that any of these children aren't his? Explain with a Punnett Square. (Please use correct notation.)

Reference no: EM132486383

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