Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 12.2, Problem 1SB
Palomino horses have a golden coat color, with a white mane and tail. Palominos do not breed true. Instead, there is a 50% chance that a foal with two Palomino parents will be a Palomino. What is the explanation?
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In horses, B=black coat, b=brown coat, T=trotter, and t=pacer. A black pacer mated to a brown trotter produces a black trotter offspring. What is the genotype for this offspring.
Horses can be cremello (a light cream color), chestnut (a reddish-brown color), or palomino (a golden color with white in the mane and tail). Of these phenotypes, only palominos never breed true. The following results have been observed:
Cremello x palomino > 50% cremello, 50% palomino
Chestnut x palomino > 50% chestnut, 50% palomino
Palomino x palomino > 25% chestnut, 50% palomino, 25% cremello
From these results, determine the appropriate allele symbols and indicate which genotypes lead to which phenotypes.
Predict the F1 and F2 phenotype ratios of a cremello x chestnut P generation cross.
In British cattle, those with long legs are called Kerry and others with extremely shortened legs are called Dexter. When Kerry cattle are crossed, their progeny have only the Kerry phenotype. When Dexter cattle are crossed with Kerry cattle, they produce Kerry and Dexter phenotypes in a 1:1 ratio. When Dexter are crossed with Dexter, 1/4 of the offspring are Kerry, 2/4 are Dexter, and 1/4 are born dead with very short legs and nose (bulldog phenotype). Interpret the genetics of the Kerry and Dexter phenotypes.
Chapter 12 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 12.1 - Two pairs of traits are segregating in a cross....Ch. 12.1 - If, instead, the four phenotypes in question 1...Ch. 12.2 - Palomino horses have a golden coat color, with a...Ch. 12.2 - A true-breeding rabbit with agouti (mottled,...Ch. 12 - The dominant C allele of a gene that controls...Ch. 12 - In peas, the allele Le produces tall plants and...Ch. 12 - Prob. 3TYKCh. 12 - What genotypes, and in what frequencies, will be...Ch. 12 - In addition to the two genes in problem 4, assume...Ch. 12 - Prob. 6TYK
Ch. 12 - In cats, the genotype AA produces tabby fur color;...Ch. 12 - Prob. 8TYKCh. 12 - The ability of humans to taste the bitter chemical...Ch. 12 - A man is homozygous dominant for alleles at 10...Ch. 12 - In guinea pigs, an allele for rough fur (R) is...Ch. 12 - Prob. 12TYKCh. 12 - Some recessive alleles have such a detrimental...Ch. 12 - In chickens, feathered legs are produced by a...Ch. 12 - A mix-up in a hospital ward caused a mother with O...Ch. 12 - Having malformed hands with shortened fingers is a...Ch. 12 - Prob. 17TYKCh. 12 - Design an Experiment Imagine that you are a...Ch. 12 - Prob. 19TYKCh. 12 - Prob. 1ITDCh. 12 - Prob. 2ITDCh. 12 - Half of the worlds population eats rice at least...
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