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Download Punnett Problems 2: CoDominance and Sex-Linked
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Punnett Problems 2: CoDominance and Sex-Linked Inheritance Directions: For each of the following problems, complete the Punnett Square provided and fill in the information requested. The first problem is done for you. Use this completed worksheet to answer the questions on the Punnett Problems 2 Quiz. Codominance A. In cattle, codominance of the allele for a red coat (R) and the allele for a white coat (W) results in offspring with a roan coat (RW); that is, a coat with both red and white hairs. Determine the possible genotypes and phenotypes of offspring produced from the cross between a red cow and a white bull. Cross (parents): RR x WW R R W RW RW W RW RW Genotype ratio: 100% RW Phenotype ratio: 100% Roan coat B. Cross a roan cow and a roan bull. What are the genotype and phenotype ratios of their offspring? Cross (parents): _____ x _____ Genotype ratio: Phenotype ratio: C. A woman and her baby are on a TV talk show to determine whether or not a particular man is the father of the child. Mom is blood type O and the baby is blood type B. The potential dad is blood type A. Is it possible this man is the baby’s father based on blood type? (hint: you may have to do more than one Punnett Square to find out) Cross (parents): _____ x _____ Genotype ratio: Phenotype ratio: Cross (parents): _____ x _____ Genotype ratio: Phenotype ratio: Sex-Linked Problems D. Color blindness is a recessive, X-linked trait. A normal sighted man marries a female who is a carrier for colorblindness (but can see color fine herself.) What are the chances their female children will be colorblind? What about their male children? Cross (parents): _____ x _____ Genotype ratio: Phenotype ratio: E. In fruit flies, gene XR produces red eyes. Gene Xr produces white eyes. XR is dominant over Xr. The Y chromosome has no genes for eye color. Cross a white-eyed female with a red-eyed male. What are the genotypes and phenotypes of the offspring? Cross (parents): _____ x _____ Genotype ratio: Phenotype ratio:
