In fruit flies, curly wing shape (C) is dominant to wild-type (c), and hairy body (H) is dominant to hairless (h). A cross of flies heterozygous at each locus results in 6 curly hairy:2 curly hairless:3 wt hairy:1 wt hairless. Which allele is lethal when homozygous? O hairy body O wild-type wings O curly wings hairless body

In fruit flies, curly wing shape (C) is dominant to wild-type (c), and hairy body (H) is dominant to hairless (h). A cross of flies heterozygous at each locus results in 6 curly hairy:2 curly hairless:3 wt hairy:1 wt hairless. Which allele is lethal when homozygous? O hairy body O wild-type wings O curly wings hairless body

Name: 15 In fruit flies, curly wing shape (C) is dominant to wild-type (c),
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Description: 15 In fruit flies, curly wing shape (C) is dominant to wild-type (c), and hairy body (H) is dominant tohairless (h). A cross of flies heterozygous at each locus results in 6 curly hairy:2 curly hairless:3 wthairy:1 wt hairless. Which allele is lethal

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter8: Patterns Of Inheritance

Section: Chapter Questions

Problem 2ACQ: Figure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are...

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More Crosses with Pea Plants: The Principle of Independent Assortment Determine the possible genotypes of the following parents by analyzing the phenotypes of their children. In this case, we will assume that brown eyes (B) is dominant to blue (b) and that right-handedness (R) is dominant to left-handedness (r). a. Parents: brown eyes, right-handed brown eyes, right-handed Offspring: 3/4 brown eyes, right-handed 1/4 blue eyes, right-handed b. Parents: brown eyes, right-handed blue eyes, right-handed Offspring: 6/16 blue eyes, right-handed 2/16 blue eyes, left-handed 6/16 brown eyes, right-handed 2/16 brown eyes, left-handed c. Parents: brown eyes, right-handed blue eyes, left-handed Offspring: 1/4 brown eyes, right-handed 1/4 brown eyes, left-handed 1/4 blue eyes, right-handed 1/4 blue eyes, left-handed
Figure 8.9 In pea plants, round peas (R) are dominant to wrinkled peas (r). You do a test cross between a pea plant with wrinkled peas (genotype rr) and a plant of unknown genotype that has round peas. You end up with three plants, all which have round peas. From this data, can you tell if the parent plant is homozygous dominant or heterozygous?
Figure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are dominant to green (y). What are the possible genotypes and phenotypes for a cross between PpYY and ppYy pea plants? How many squares would you need to complete a Punnett square analysis of this cross?
Fruit flies having one allele for curly wings (Cy) and one allele for normal wings (Cy+) develp curly wings. Fruit flies homozygous for normal wings (Cy+) develop normal wings. When two curly-winged flies were crossed, 204 curly-winged and 98 normal-winged flies. In fact, all crosses between curly-winged flies produce nearly the same curly-winged to normal-winged ratio. How would you explain these results? The Cy allele is epistatic to the Cy+ allele. The Cy+ allelle shows partial dominance over the Cy allele. The Cy allele is dominant for the curly phenotype and is lethal when homozygous. The Cy+ allele is dominant over the Cy allele and is lethal when homozygous. The Cy+ and Cy alles are co-dominant.
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?
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.
There is an autosomal gene in cats that controls whether or not they also have white patches of fur (W = white spots, w= no white spots). Considering this along with the Orange gene (O0 and OB) from the previous question, and how it works, how many possible genotypes (using these 4 alleles) are there for cats that are orange, black, and white (in other words, calico)?
An allele in Drosophila produces a star-eye trait in the heterozygous individual. However, the star-eye allele is lethal in homozygotes. What would be the ratio of phenotypes of survivingoffspring if star-eyed flies were crossed to each other?
In cattle, coat color is inherited in a co-dominant fashion. Homozygous C R C R produces red coat,homozygous C W C W produces white coat, and the heterozygous C R C W produces roan-colored coat.What is the probability of having a roan-coated offspring in a cross between a white-coated cattle anda roan-coated cattle?
. In tigers, a recessive allele of a particular gene causes both anabsence of fur pigmentation (a white tiger) and a cross-eyed condition. If two phenotypically normal tigers that are heterozygousat this locus are mated, what percentage of their offspring will becross-eyed? What percentage of cross-eyed tigers will be white?
Let’s suppose that a gene affecting pigmentation is found on the Xchromosome (in mammals or insects) or the Z chromosome (inbirds) but not on the Y or W chromosome. It is found on an autosome in bees. This gene exists in two alleles: D (dark) is dominant tod (light). What would be the phenotypic results of crosses betweentrue-breeding dark females and true-breeding light males and of thereciprocal crosses involving true-breeding light females and truebreeding dark males for each of the following species?A. Birds C. BeesB. Fruit flies D. Humans
. In corn, the allele A allows the deposition ofanthocyanin (blue) pigment in the kernels(seeds), while aa plants have yellow kernels.At a second gene, W- produces smoothkernels, while ww kernels are wrinkled. Aplant with blue smooth kernels was crossedto a plant with yellow wrinkled kernels. Theprogeny consisted of 1447 blue smooth, 169blue wrinkled, 186 yellow smooth, and 1510yellow wrinkled.a. Are the a and w loci linked? If so, how farapart are they?b. What was the genotype of the blue smoothparent? Include the chromosomearrangement of alleles.c. If a plant grown from a blue wrinkled progenyseed is crossed to a plant grown from ayellow smooth F1 seed, what kinds of kernelswould be expected, and in what proportions?