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2. Tail length in dogs is controlled by the allele 'L' and is incompletely dominant over the 'I' allele while the heterozygote has a length in between short and long tail. For example, a research laboratory mates 10 heterozygous dogs, and among the offsprings, 42 have medium-length tails and 19 have short tails. Your tasks: a. Illustrate the cross. b. Draw a Punnet square to show offspring. c. What is the phenotypic ratio? d. Why does a 1:2:1 rather than a 3:1 ratio result from this cross?

2. Tail length in dogs is controlled by the allele 'L' and is incompletely dominant over the 'I' allele while the heterozygote has a length in between short and long tail. For example, a research laboratory mates 10 heterozygous dogs, and among the offsprings, 42 have medium-length tails and 19 have short tails. Your tasks: a. Illustrate the cross. b. Draw a Punnet square to show offspring. c. What is the phenotypic ratio? d. Why does a 1:2:1 rather than a 3:1 ratio result from this cross?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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2. Tail length in dogs is controlled by the allele 'L' and is incompletely dominant over the 'I' allele while the heterozygote has a length in between short and long tail. For example, a research laboratory mates 10 heterozygous dogs, and among the offsprings, 42 have medium-length tails and 19 have short tails. Your tasks: a. Illustrate the cross. b. Draw a Punnet square to show offspring. c. What is the phenotypic ratio? d. Why does a 1:2:1 rather than a 3:1 ratio result from this cross? 3. In Cw is the white allele, Co is the black allele and c is the albino allele. Both Cw and C are dominant over c, at the same time co-dominant with each other. Heterozygotes (CWC") are spotted. a. What are the genotypes and phenotypes of the offspring from a heterozygous black-coated rabbit and a homozygous white-coated rabbit? Show your cross and phenotypic ratio.. b. 4. In families, where both parents have sickle cell trait, what is the probability of having: a. a child with sickle trait? (carrier) b. a normal child? c. Show the cross and the outcome of the cross.
Transcribed Image Text:2. Tail length in dogs is controlled by the allele 'L' and is incompletely dominant over the 'I' allele while the heterozygote has a length in between short and long tail. For example, a research laboratory mates 10 heterozygous dogs, and among the offsprings, 42 have medium-length tails and 19 have short tails. Your tasks: a. Illustrate the cross. b. Draw a Punnet square to show offspring. c. What is the phenotypic ratio? d. Why does a 1:2:1 rather than a 3:1 ratio result from this cross? 3. In Cw is the white allele, Co is the black allele and c is the albino allele. Both Cw and C are dominant over c, at the same time co-dominant with each other. Heterozygotes (CWC") are spotted. a. What are the genotypes and phenotypes of the offspring from a heterozygous black-coated rabbit and a homozygous white-coated rabbit? Show your cross and phenotypic ratio.. b. 4. In families, where both parents have sickle cell trait, what is the probability of having: a. a child with sickle trait? (carrier) b. a normal child? c. Show the cross and the outcome of the cross.
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