Name Date Period. Review on Incomplete Dominance/ Codominance and Multiple Alleles

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1 Pollen Name DatePeriod Review on Incomplete Dominance/ Codominance and Multiple Alleles 1. In snapdragon flowers, the red (C R ) and white (C W ) flower color alleles exhibit incomplete dominance. Flowers with the genotype C R C W are pink. Fill in the Punnett square below to determine the probabilities of different offspring in a cross of two pink snapdragon flowers (C R C W x C R C W ). Egg Offspring Phenotypes: Phenotype Ratio: Probability of red flowered offspring Probability of pink flowered offspring Probability of white flowered offspring 2. Circle all the traits below that exhibit incomplete dominance or codominance. 3. Explain how you can determine which traits above show incomplete dominance or codominance.

2 Sperm 4. In cattle, roan cattle are cattle that exhibit codominance of red and white hair color alleles. Roan cattle have both red and white hairs expressed F R F W. Which of the following cattle matings would produce the greatest number of roan offspring: Roan x Roan Red x White Red x Roan White x Roan 5. Checkered chickens are the result of codominance between the black feather allele (C B ) and the white feathered allele (C W ). Can there be a truebreeding strain of checkered chickens? Explain why or why not. 6. The curly hair (H C ) and straight hair (H S ) alleles exhibit codominance, to produce a wavy hair phenotype for heterozygotes (H C H S ). If a father has straight hair, and a mother has wavy hair, what is the probability of different hair phenotypes for their children? Egg Phenotype Ratio: Probability of Curly Hair Probability of Wavy Hair Probability of Straight Hair

3 7. Blood type in humans is a trait that exhibits multiple alleles. There are three possible alleles for the main blood marker gene: I A, I B and i. Alleles I A and I B exhibit codominance. The allele i, for blood type O, is recessive. For each of the following blood type phenotypes, determine the possible genotypes. Phenotype A B AB O Possible Genotypes 8. In a maternity ward, Mrs. Bright and Mrs. Light share a room. When they are ready to go home, Mrs. Bright insists she has been given the wrong baby. Analyze the blood type evidence below to see if it supports, disproves or is inconclusive in this maternity issue. Blood Types Possible Genotypes Mrs. Bright AB Mr. Bright O Baby at Bright s house O Mrs. Light A Mr. Light A Baby at Light s house A Was there a mix-up of babies in the hospital? 9. What are the possible blood types of the offspring between a father who is blood type AB and a mother who is blood type O. A. AB or O D. A, B, AB or O B. A, B or O E. A, B or AB C. A or B

4 10. What are the possible blood types of the offspring between a father who is blood type A and a mother who is blood type B. A. AB or O D. A, B, AB or O B. A, B or O E. A, B or AB C. A or B In addition to the gene that controls the A, B, AB or O blood type, a second gene in humans controls whether a person s red blood cells have an Rh factor present. Rh positive (R) is dominant over Rh negative (r). Use the following information for questions A woman who belongs to the blood group A is Rh posititve. She has a daughter who is O positive and a son who is B negative. 11. Which of the following is a possible genotype of the son? A. I B I B rr D. I B i rr B. I B I B RR E. I B I B Rr C. I B i Rr 12. Which of the following is a possible genotype of the mother? A. I A I A RR D. I A i Rr B. I A I A Rr E. I A i RR C. I A i rr 13. Which of the following is a possible phenotype for the father? A. A negative D. A positive B. B negative E. O positive C. B positive F. Either B or C 14. A man is brought to court for a paternity case. He has blood type B positive. The mother has blood group B negative. The child has blood type A negative. What can you say about the man s chances of being the father? A. He is the father C. He can not be the father B. He might be the father D. He is unlikely to be the father

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