Biological Science (6th Edition)
6th Edition
ISBN: 9780321976499
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Emily Taylor, Greg Podgorski, Jeff Carmichael
Publisher: PEARSON
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Chapter 14, Problem 13TYPSS
The smooth feathers on the back of the neck in pigeons can be reversed by a mutation to produce a “crested” appearance in which feathers form a distinctive spike at the back of the head. A pigeon breeder examined offspring produced by a single pair of non-crested birds and recorded the following: 22 non-crested and 7 crested. She then made a series of crosses using offspring from the first cross. When she crossed two of the crested birds, all 20 of the offspring were crested. When she crossed a non-crested bird with a crested bird, 7 offspring were non-crested and 6 were crested.
• For these three crosses, provide genotypes for parents and offspring that are consistent with these results.
• Which allele is dominant?
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On a fox ranch in Scandinavia, a mutation arose that yielded a “platinum” coat color. The platinum color proved very popular in the fox coat trade, but, in spite of enormous effort on the part of fox breeders, a pure- breeding platinum strain was never achieved. Every time that two platinum fox were crossed, some wild-type offspring appeared in the progeny. For example, the repeated crosses of a single pair of platinum fox produced 83 platinum and 38 wild-type progeny. All other such crosses gave similar progeny ratios. State the genetic hypothesis that accounts for these results.
The tiny blue-eyed Mary flower is often one of the first flowers seen in the spring in some regions of the United States. The flower is normally blue, but sometimes a white or pink flower variation is found. The following data were obtained after several crosses.
A student claims that these flower colors are an inherited trait, and the F1 and F2 phenotypes of the flowers arising from the pink and white cross can best be explained by epistasis, where another gene product influences phenotype expression.
This data supports this claim because in order to produce a __________ (pink, white, or blue) flower, a gene for a switch that 'turns on' the color gene would be recessive, meaning it has a mutation that causes it to be 'off'. In order to express a color, this switch needs to be in the dominant form.
The color gene is a structural gene that has two variants: a dominant trait, ______ (pink, white, or blue) and a recessive _______ (pink, white, or blue) variety.
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
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What additional cross might be carried out to determine if your explanation is correct?
Note: recessive lethal epistatis
Chapter 14 Solutions
Biological Science (6th Edition)
Ch. 14 - 1. The genes for the trails that Mendel worked...Ch. 14 - 2. CAUTION Why is the pea wrinkled-seed allele a...Ch. 14 - Prob. 3TYKCh. 14 - 4. Mendel’s rules do not correctly predict...Ch. 14 - Prob. 5TYKCh. 14 - Prob. 6TYKCh. 14 - Example Problem Two black female mice are crossed...Ch. 14 - Prob. 8TYKCh. 14 - Prob. 9TYPSSCh. 14 - Prob. 10TYPSS
Ch. 14 - 11. In garden peas, yellow seeds (Y) are dominant...Ch. 14 - Prob. 12TYPSSCh. 14 - The smooth feathers on the back of the neck in...Ch. 14 - SOCIETY As a genetic counselor, you advise couples...Ch. 14 - 15. Suppose you are heterozygous for two genes...Ch. 14 - Suppose a woman with blood type O married a man...Ch. 14 - Prob. 17TYPSSCh. 14 - Society Two mothers give birth to sons at the same...Ch. 14 - Prob. 19TYPSSCh. 14 - QUANTITATIVE Recall that hemophilia is an X-linked...Ch. 14 - Prob. 21PIATCh. 14 - Given the pedigree, what is the most likely mode...Ch. 14 - Prob. 23PIATCh. 14 - QUANTITATIVE If the son with ALD in the third...Ch. 14 - Prob. 25PIATCh. 14 - Prob. 26PIAT
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