Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 15.3, Problem 1CC
Summary Introduction
To write:
Whether two affected individual can reproduce an unaffected offspring with a recessive mutation.
Introduction:
The genes are the hereditary unit of life and the alleles are the variant of the genes. In general, two type of alleles are present, dominant and the recessive allele. Two alleles make a functional copy of the gene.
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As seen in the photo, Labradors come in three colors-- black, brown and yellow. What is the genetic basis for these different coat colors? One gene produces melanin, a pigment which is deposited in the dog's fur and makes the color dark. With this gene, allele B (black) is dominant to allele b. Only in the case of a recessive homozygote (bb) will the dog's phenotype be brown. The regulatory gene is separate from the melanin gene but it acts as a switch, either turning the melanin gene on or turning it off. Allele E is dominant and allows for the melanin to be deposited in the dog's fur ("on" switch), but if the switch gene is a recessive homozygote, the melanin is blocked ("off" switch) and a yellow dog is the result!
1. Two other Labradors mate and produce puppies. Their genotypes are Bbee and BbEe. What color are each parent and what are the phenotypic rations of their offspring in the F1 Generation? Show your work with a Punnett square.
As seen in the photo, Labradors come in three colors-- black, brown and yellow. What is the genetic basis for these different coat colors? One gene produces melanin, a pigment which is deposited in the dog's fur and makes the color dark. With this gene, allele B (black) is dominant to allele b. Only in the case of a recessive homozygote (bb) will the dog's phenotype be brown. The regulatory gene is separate from the melanin gene but it acts as a switch, either turning the melanin gene on or turning it off. Allele E is dominant and allows for the melanin to be deposited in the dog's fur ("on" switch), but if the switch gene is a recessive homozygote, the melanin is blocked ("off" switch) and a yellow dog is the result!
Review the information on Labrador retrievers above. What are the phenotypic ratios of the F1 generation offspring of two dihybrids? Make sure to match the numbers with coat colors (e.g, which number in the ration goes with which color). Use a Punnett square to…
One form of the bleeding disorder known as von Willebrand disease is an autosomal recessive disease. A man who is a carrier marries a woman who is also a carrier of the disease.
(a) What percentage of their children are likely to have a disease phenotype?
(b) What percentage of their children are likely to have a normal phenotype?
(c) What percentage of their children are likely to be carriers of the disease?
Chapter 15 Solutions
Principles of Biology
Ch. 15.1 - Prob. 1CCCh. 15.1 - Why are the stamens removed from the purple...Ch. 15.1 - Prob. 3CCCh. 15.1 - Prob. 4CCCh. 15.1 - Prob. 5CCCh. 15.1 - Prob. 1TYKCh. 15.1 - Prob. 2TYKCh. 15.2 - Prob. 1BCCh. 15.2 - Prob. 2BCCh. 15.2 - Lets suppose that a cell is heterozygous for three...
Ch. 15.2 - Prob. 1TYKCh. 15.2 - Which phase of cellular division explains Mendel*s...Ch. 15.3 - Prob. 1CCCh. 15.3 - Prob. 2CCCh. 15.3 - Prob. 1TYKCh. 15.4 - Prob. 1CCCh. 15.4 - In pea plants, P is a dominant allele that confers...Ch. 15.4 - The effects of a gene may be pleiotropic because...Ch. 15.5 - Prob. 1CCCh. 15.5 - Prob. 1TYKCh. 15.5 - Prob. 2TYKCh. 15 - Experimental advantages of using pea plants...Ch. 15 - Which of the following phenomena cannot be deduced...Ch. 15 - Prob. 3TYCh. 15 - Prob. 4TYCh. 15 - Prob. 5TYCh. 15 - Prob. 6TYCh. 15 - Prob. 7TYCh. 15 - Prob. 8TYCh. 15 - A hypothetical flowering plant species produces...Ch. 15 - Prob. 10TYCh. 15 - Describe the difference between genotype and...Ch. 15 - When examining a human pedigree, what patterns do...Ch. 15 - Prob. 3CCQCh. 15 - Prob. 1CBQCh. 15 - Prob. 2CBQ
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