In 1981, a stray black catwith unusual rounded,curled-back ears was adoptedby a family in California.Hundreds of descendants ofthe cat have since been born,and cat fanciers hope to develop the curl cat into a showbreed. Suppose you ownedthe first curl cat and wantedto develop a true-breeding variety. How would you determinewhether the curl allele is dominant or recessive? How wouldyou obtain true-breeding curl cats? How could you be sure theyare true-breeding?

In 1981, a stray black catwith unusual rounded,curled-back ears was adoptedby a family in California.Hundreds of descendants ofthe cat have since been born,and cat fanciers hope to develop the curl cat into a showbreed. Suppose you ownedthe first curl cat and wantedto develop a true-breeding variety. How would you determinewhether the curl allele is dominant or recessive? How wouldyou obtain true-breeding curl cats? How could you be sure theyare true-breeding?

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Description: In 1981, a stray black catwith unusual rounded,curled-back ears was adoptedby a family in California.Hundreds of descendants ofthe cat have since been born,and cat fanciers hope to develop the curl cat into a showbreed. Suppose you ownedthe first cur

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter19: Introduction To Genetics

Section: Chapter Questions

Problem 5CT: When you decide to breed your Labrador retriever Molly and sell the puppies, you discover that two...

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In an alternate universe, all the genes in all species haveonly two alleles, one dominant and one recessive. Wouldevery trait have only two phenotypes? Would all membersof a species that are dominant for a given gene have exactlythe same phenotype? Explain your reasoning.
A farmer wants to breed a variety of taller corn.a) How can the farmer use variation in the height of thecurrent corn plants to produce taller corn plants?b) Will the farmer's work be most effective if height incorn plants is determined by polygenic inheritance,multiple alleles, or co-dominant alleles? Explain.c) The farmer finds that many of the tallest corn plantsare also very susceptible to a particular disease. Howcould the farmer design an experiment to find outif the genes for height are linked to the genes forresistance to the disease?d) If these genes are linked, what steps could the farmertake to create a breed of corn that is taller and moredisease-resistant than the current corn crop?
Midphalangeal hair (hair on top of the middlesegment of the fingers) is a common phenotypecaused by a dominant allele M. Homozygotes forthe recessive allele (mm) lack hair on the middlesegment of their fingers. Among 1000 families inwhich both parents had midphalangeal hair, 1853children showed the trait while 209 children did not.Explain this result
In a population of wild squirrels, most of them have gray fur, butan occasional squirrel is completely white. If we let P and p represent dominant and recessive alleles, respectively, of a genethat encodes an enzyme necessary for pigment formation,which of the following statements do you think is most likely tobe correct?a. The white squirrels are pp, and the p allele is a loss-offunction allele.b. The gray squirrels are pp, and the p allele is a loss-offunction allele.c. The white squirrels are PP, and the P allele is a loss-offunction allele.d. The gray squirrels are PP, and the P allele is a loss-offunction allel
A cross between two pea plants, both of which grewfrom yellow round seeds, gave the following numbersof seeds: 156 yellow round and 54 yellow wrinkled.What are the genotypes of the parent plants? (Yellowand round are dominant traits.)
With regard to heterosis, is each of the following statements consistent with the dominance hypothesis, the overdominance hypothesis, or both? A. Strains that have been highly inbred have become monomorphicfor one or more recessive alleles that are somewhat detrimentalto the organism. B. Hybrid vigor occurs because highly inbred strains are monomorphicfor many genes, whereas hybrids are more likely to beheterozygous for those same genes.C. If a gene exists in two alleles, hybrids are more vigorousbecause heterozygosity for the gene is more beneficial thanhomozygosity of either allele.
An alien friend named Tukan has two sets of eyes, one setforward-looking and one set backward-looking, and smooth skin.His mate, Valco, lacks eyes but has skin covered with tiny hooksthat attract all sorts of debris. Tukan and Valco have thrived onearth and have had four children, all with no eyes and smoothskin. Typical of their ways, the children interbred and produced 32children of their own.. Under the models of inheritance proposed by Mendel, identifywhich alleles are dominant and which are recessive.. Provide gene symbols that would reflect the dominant–recessiveallelic relationships..Of the 32 children, how many would you expect to have two setsof eyes and smooth skin?
Morgan obtained a white-eyed male fly in a population containing many red-eyed flies that he thought were truebreeding. As mentioned in the experiment, he crossed this fly withseveral red-eyed females, and all the offspring had red eyes. Butactually this is not quite true. Morgan observed 1237 red-eyed fliesand 3 white-eyed males. Provide two or more explanations why heobtained 3 white-eyed males in the F1 generation.
A mouse from a true-breeding population with normal gait was crossed to a mouse displaying an oddgait called dancing. The F1 animals all showednormal gait.a. If dancing is caused by homozygosity for the recessive allele of a single gene, what proportion ofthe F2 mice should be dancers?b. If mice must be homozygous for recessive allelesof each of two different genes to have the dancing phenotype, what proportion of the F2 shouldbe dancers if the two genes are unlinked?(Assume that all the mice in the populationwith normal gait were homozygous fordominant alleles.)c. When the F2 mice were obtained, 42 normal and8 dancers were seen. Use the chi-square test todetermine if these results better fit the one-genemodel from part (a) or the two-gene model frompart (b).
In cats, a temperature-sensitive allele produces the Siamese phenotype, in which the cooler extremities are dark and the warmertrunk area is lighter. A Siamese cat that spends most of its timeoutside was accidentally injured in a trap and required severalstitches in its right front paw. The veterinarian had to shave the furfrom the paw and leg, which originally had rather dark fur. Later,when the fur grew back, it was much lighter than the fur on theother three legs. Do you think this injury occurred in the hot summer or cold winter? Explain your answer
A recessive allele in mice results in an unusually long neck. Sometimes,during early embryonic development, the long neck causesthe embryo to die. An experimenter began with a population oftrue-breeding mice with normal necks and true-breeding mice withlong necks. Crosses were made between these two populations toproduce an F1 generation of mice with normal necks. The F1 micewere then mated to each other to obtain an F2 generation. For themice that were born alive, the following data were obtained:522 mice with normal necks62 mice with long necksWhat percentage of homozygous mice (that would have had longnecks if they had survived) died during embryonic development?
Piebald spotting is a condition found in humans inwhich there are patches of skin that lack pigmentation. The condition results from the inability ofpigment-producing cells to migrate properly duringdevelopment. Two adults with piebald spotting haveone child who has this trait and a second child withnormal skin pigmentation.a. Is the piebald spotting trait dominant or recessive?What information led you to this answer?b. What are the genotypes of the parents?