Biology
11th Edition
ISBN: 9781259188138
Author: Peter H Raven, George B Johnson Professor, Kenneth A. Mason Dr. Ph.D., Jonathan Losos Dr., Susan Singer
Publisher: McGraw-Hill Education
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Chapter 12, Problem 4S
In mammals, a variety of genes affect coat color. One of these is a gene with mutant alleles that results in the complete loss of pigment, or albinism. Another controls the type of dark pigment with alleles that lead to black or brown colors. The albinistic trait is recessive, and black is dominant to brown. Two black mice are crossed and yield 9 black:4 albino:3 brown. How would you explain these results?
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Coat color in mice is influenced by two genes, one for color (A) and one for the amount of pigment production (C). Mice with the wild type agouti coat color have a yellowish to brownish color. Mice also have a gene that determines the amount of pigment the hair produces.
Mouse Coat Phenotype and Genotype Correlation
Agouti coat
AA, Aa
Solid gray/black coat
aa
Pigment production
CC, Cc
Albinism
cc
Multiple crosses were made between male and female mice that were each heterozygous for both traits (AaCc). The data table shows the number of mice of each coat type. Calculate the average F1 generation coat color to answer the question.
Coat Color
Number of Mice Born in Each Trial Cross
Mean Number of Mice
1
2
3
4
5
6
7
8
9
10
Agouti coat
11
8
9
9
10
8
10
7
10
9
Solid gray/black coat
5
2
1
3
4
3
4
3
3
2
Albinism
3
3
6
4
4
3
3
7
4
3
Which…
In mice, short hair is dominant over long hair. If a heterozygous shorthaired male is crossed with a heterozygous female, what percentage of the offspring are predicted to have long hair?
Group of answer choices
In humans, brown eyes (B) are dominant over blue. A brown eyed man marries a blue-eyed (b) woman and they have three children two of whom are brown-eyed and one of whom is blue-eyed.
if blue is recessive, what must the woman’s genotype be?
Chapter 12 Solutions
Biology
Ch. 12 - What property distinguished Mendels investigation...Ch. 12 - The F1 generation of the monohybrid cross purple...Ch. 12 - The F1 plants from the previous question are...Ch. 12 - In a cross of Aa Bb cc X Aa Bb Cc, what is the...Ch. 12 - An organisms __________ is/are determined by its...Ch. 12 - Phenotypes like height in humans, which show a...Ch. 12 - Japanese four oclocks that are red and tall are...Ch. 12 - If the two genes in the previous question showed...Ch. 12 - What is the probability of obtaining an individual...Ch. 12 - Prob. 4A
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- In a population of pea plants, there are two variations for flower colors-- purple and white. The allele for purple is dominant, but the white allele is recessive. If a test-cross is performed, What percentage will yield purple flowers?arrow_forwardA scientist is investigating the inheritance of two autosomal recessive genes in rat, ear length (long is dominant to short) and fur color (gray is dominant to white). The table below provides the number of observed off-spring for each phenotype, when heterozygous rats are crossed. What are the expected values for each phenotype? Phenotype Observed Expected Long, gray 189 Long, white 56 Short, gray 74 Short, white 23 Total 342arrow_forwardin a certain plant, when individuals with blue flowers are crossed with individuals with blue flowers, only blue flowers are produced. plants with red flowers crossed with plants with red flowers sometimes produce only red flowers, although other times they produce either red or blue flowers. when plants with red flowers are crossed with plants with blue flowers, sometimes only red flowers are produced; other times either red or blue flowers are produced. which of the following is true? Red is incompletely dominant Red is recessive Red is dominant Red is codominant Blue is dominantarrow_forward
- Spotting in horses is a dominant trait. Cross a homozygous spotted horse with a homozygous solid-colored horse. What are the genotypes and phenotypes of their offspring? Cross two of the offspring from the above cross. What are the genotypes and phenotypes or their offspring? Cross a heterozygous spotted horse with a solid-colored horse. What are the genotypes and phenotypes of their offspring?arrow_forwardIn rabbits, the dominant allele B causes black fur and the recessive allele b causes brown fur; for an independently assorting gene, the dominant allele R causes long fur and the recessive allele r causes short fur. A homozygous rabbit with long, black fur is crossed with a rabbit with short, brown fur, and the offspring are intercrossed. In the F2, what proportion of the rabbits with long, black fur will be homozygous for both genes? Show drawings and solution.arrow_forwardIn the fruit fly Drosophila melanogaster, wild type body colour is black and is a dominant trait, whereas grey body colour is a recessive trait. You are given a black body fly. How would you determine the genotype of this fly using traditional crossing experiments? Include in your answer the possible results and what they mean.arrow_forward
- In guinea pigs, black hair is dominant over white hair. If a homozygous black guinea pig (father) were crossed with a homozygous white guinea pig (mother), the first generation of offspring would be all black.Match the mother's and father's genotypes and phenotypes to their correct description. 1. mother's phenotype 2. father's phenotype 3. father's genotype 4. mother's genotype a. black b. HH c. white d. hharrow_forwardIn a population of pea plants, there are two variations for flower colors-- purple and white. The allele for purple is dominant, but the white allele is recessive. If a test-cross is performed and 1000 plants are coiunted, approximately how many plants will have white flowers?arrow_forwardIn pea plants, flower color is determined by one gene with two alleles, with the allele coding for purple flowers (P) being dominant to the allele coding for white flowers (p). If two purple-flowered offspring resulting from a cross between homozygous dominant and white-flowered parents are crossed, what percentage of the progeny are expected to have the dominant phenotype?arrow_forward
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