Most of the feathers of erminette fowl are light colored, with an occasional black one, giving a fleckedappearance. A cross of two erminettes produced a totalof 48 progeny, consisting of 22 erminettes, 14 blacks,and 12 pure whites. What genetic basis of the erminette pattern is suggested? How would you test yourhypotheses?

Most of the feathers of erminette fowl are light colored, with an occasional black one, giving a fleckedappearance. A cross of two erminettes produced a totalof 48 progeny, consisting of 22 erminettes, 14 blacks,and 12 pure whites. What genetic basis of the erminette pattern is suggested? How would you test yourhypotheses?

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter3: Transmission Of Genes From Generation To Generation

Section: Chapter Questions

Problem 16QP: More Crosses with Pea Plants: The Principle of Independent Assortment Consider the following cross...

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In a vial of Drosophila, a research student noticedseveral female flies (but no male flies) with bag wingseach consisting of a large, liquid-filled blister insteadof the usual smooth wing blade. When bag-wingedfemales were crossed with wild-type males, 1/3 of theprogeny were bag-winged females, 1/3 were normalwinged females, and 1/3 were normal-winged males.Explain these results.
Three genes in fruit flies affect a particular trait, andone dominant allele of each gene is necessary to get awild-type phenotype.a. What phenotypic ratios would you predict amongthe progeny if you crossed triply heterozygous flies?b. You cross a particular wild-type male in successionwith three tester strains. In the cross with one testerstrain (AA bb cc), only 1/4 of the progeny are wildtype. In the crosses involving the other two testerstrains (aa BB cc and aa bb CC), half of the progeny are wild type. What is the genotype of thewild-type male?
A wild-type fruit fly (heterozygous for gray body color andred eyes) is mated with a black fruit fly with purple eyes. Theoffspring are wild-type, 721; black purple, 751; gray purple, 49;black red, 45. What is the recombination frequency betweenthese genes for body color and eye color? Using informationfrom problem 3, what fruit flies (genotypes and phenotypes)would you mate to determine the order of the body color, wingsize, and eye color genes on the chromosome?
Pea plants with purple pollen and long-shaped pollen were crossed with each other withthe following offspring: 296 purple long-shaped pollen; 19 with purple round-shapedpollen; 27 with red long-shaped pollen; 85 with red round-shaped pollen. Explain thisbizarre outcome!
Erminette fowls have mostly light coloured feathers with an occasional black one, giving a flecked appearance. A cross of two erminettes produced a total of 48 progeny, consisting of 22 erminettes, 14 blacks, and 12 pure whites. What genetic basis of the erminette pattern is suggested? How would you test your hypotheses?
A pea plant that is (RrYy) is allowed to self-fertilize. Round seed(R) is dominant to wrinkled (r), and yellow seed (Y) is dominant togreen (y). What is the probability of producing the following groupof five seeds: two round, yellow; one round, green; one wrinkled,yellow; and one wrinkled, green?
Erminette fowls have mostly light colored feathers with an occasional black one, giving a flecked appearance. A cross of two erminettes produced a total of 48 progeny, consisting of 22 erminettes, 14 blacks and 12 pure whites. What genetic basis of the erminette pattern is suggested? How would you test your hypotheses?
Erminette fowls have mostly light coloured feathers with an occasional black one, giving a flecked appearance. A cross of two erminettes produced a total of 48 progeny, consisting of 22 erminettes, 14 blacks, and 12 pure whites. What genetic basis of erminette pattern is suggested? How would you test your hypothesis?
Mexican hairless dogs have little hair and few teeth. When aMexican hairless is mated to another breed of dog, about half ofthe puppies are hairless. When two Mexican hairless dogs aremated to each other, about 1/3 of the surviving puppies have hairand about 2/3 of the surviving puppies are hairless. However,about two out of eight puppies from this type of cross are borngrossly deformed and do not survive. Explain this pattern ofinheritance.
When Calvin Bridges observed a large number of offspring from a cross of white-eyed female Drosophila tored-eyed males, he found very rare white-eyed femalesand red-eyed males among the offspring. He was ableto show that these exceptions resulted from nondisjunction, such that the white-eyed females had received twoXs from the egg and a Y from the sperm, while thered-eyed males had received no sex chromosome fromthe egg and an X from the sperm. What progeny wouldhave arisen from these same kinds of nondisjunctionalevents if they had occurred in the male parent? Whatwould their eye colors have been?
Fruit flies with one allele for curly wings (Cy) andone allele for normal wings (Cy+) have curly wings.When two curly-winged flies were crossed, 203curly-winged and 98 normal-winged flies wereobtained. In fact, all crosses between curly-wingedflies produce nearly the same curly : normal ratioamong the progeny.a. What is the approximate phenotypic ratio in theseoffspring?b. Suggest an explanation for these data.c. If a curly-winged fly was mated to a normalwinged fly, how many flies of each type would youexpect among 180 total offspring?
A student whose hobby was fishing pulled a very unusual carp out of Cayuga Lake: It had no scales on itsbody. She decided to investigate whether this strangenude phenotype had a genetic basis. She therefore obtained some inbred carp that were pure-breeding forthe wild-type scale phenotype (body covered withscales in a regular pattern) and crossed them with hernude fish. To her surprise, the F1 progeny consistedof a 1:1 ratio of wild-type fish and fish with a singlelinear row of scales on each side.a. Can a single gene with two alleles account for thisresult? Why or why not?b. To follow up on the first cross, the student allowedthe linear fish from the F1 generation to mate witheach other. The progeny of this cross consisted offish with four phenotypes: linear, wild type, nude,and scattered (the latter had a few scales scattered irregularly on the body). The ratio of these phenotypeswas 6:3:2:1, respectively. How many genes appear tobe involved in determining these phenotypes?c. In…