Genetic Analysis: An Integrated Approach (2nd Edition)
2nd Edition
ISBN: 9780321948908
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter 4, Problem 34P
In a breed of domestic cattle, horns can appear on malesand on females. Males and females can also be hornless. The following crosses are performed with parents from pure-breeding lines.
Explain the inheritance of this
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The Labrador Retriever’s coat colours are black, yellow, and chocolate.Yellow is produced by the presence of a recessive epistatic gene, which has the effect of masking the black and chocolate colour genes. Black (B) is dominant to chocolate (b).Therefore, the possible genotypes and corresponding phenotypes are:
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Chapter 4 Solutions
Genetic Analysis: An Integrated Approach (2nd Edition)
Ch. 4 - 1. Define and distinguish incomplete penetrance...Ch. 4 -
2. Define and distinguish epistasis and...Ch. 4 - When working on barley plants, two researchers...Ch. 4 - Fifteen bacterial colonies growing on a complete...Ch. 4 - 5. In a type of parakeet known as a “budgie,”...Ch. 4 - 6. The and blood groups are given below for four...Ch. 4 - The wild-type color of horned beetles is black,...Ch. 4 - 8. Two genes interact to produce various...Ch. 4 - Prob. 9PCh. 4 - 10. In rats, gene produces black coat color if the...
Ch. 4 - 11. In the rats identified in Problem, a third...Ch. 4 - Using the information provided in Problems 10 and...Ch. 4 - 13. Total cholesterol in blood is reported as the...Ch. 4 - 14. Flower color in snapdragons results from the...Ch. 4 - 5. A plant line with reduced fertility comes to...Ch. 4 - Prob. 16PCh. 4 - The coat color in mink is controlled by two...Ch. 4 - Prob. 18PCh. 4 - 19. Feather color in parakeets is produced by the...Ch. 4 - Brachydactyly type D is a human autosomal dominant...Ch. 4 - 21. A male and a female mouse are each from...Ch. 4 - Xerodermapigmentosum (XP) is an autosomal...Ch. 4 - 23. Three strains of green-seeded lentil plants...Ch. 4 - Blue flower color is produced in a species of...Ch. 4 - 25. The following crosses are performed between...Ch. 4 - Two pure-breeding strains of summer squash...Ch. 4 - Marfan syndrome is an autosomal dominant disorder...Ch. 4 - 28. Yeast are single-celled eukaryotic organisms...Ch. 4 - Prob. 29PCh. 4 - Dr. Ara B. Dopsis and Dr. C. Ellie Gans are...Ch. 4 - Human ABO blood type is determined by three...Ch. 4 - In rabbits, albinism is an autosomal recessive...Ch. 4 - Dr. O. Sophila, a close friend of Dr. Ara B....Ch. 4 - In a breed of domestic cattle, horns can appear on...
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- A geneticist crosses two yellow mice with straight hair and obtains the following progeny: 1/2 yellow straight, 1/6 yellow fuzzy, 1/4 gray straight and 1/12 gray fuzzy What additional cross might be carried out to determine if your explanation is correct? Note: recessive lethal epistatisarrow_forwardIn a parental cross of a ADHL disease trait, where the father is affected and the mother is unaffected, 50% of the offspring will have the disease phenotype and 50% will have the WT phenotype. In an F1 cross between an affected male and an affected female, the respective proportions of the disease phenotype and WT phenotype are:arrow_forwardA number of all-white cats are crossed, and they produce the following types of progeny: 1216 all-white, 316 black, and 116 gray. What is the genotype of the black progeny? a. Aa b. Aa Bb c. A_B_ d. A_barrow_forward
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- A particular walnut rooster was crossed to a pea hen, and the progeny consisted of 12 walnut, 11 pea, 3 rose, and 4 single chickens. What are the likely genotypes of the parents?arrow_forwardA geneticist crosses two yellow mice with straight hair and obtains the following progeny: 12 yellow, straight 16 yellow, fuzzy 14 gray, straight 112 gray, fuzzya. Provide a genetic explanation for the results and assign genotypes to theparents and progeny of this cross.b. What additional crosses might be carried out to determine if yourexplanation is correct?arrow_forwardIn a true breeding parental cross for an Autosomal recessive disease trait, the expected proportion of males in the F2 generation that are unaffected is:arrow_forward
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