Assume that tail length in mice is a quantitative trait involving two genes, each with 2...
- Assume that tail length in mice is a quantitative trait involving two genes, each with 2 alleles. One allele at each gene contributes to long tails, the other allele at each gene does not (small tails). The genes are located on different autosomes. Mice with 0 contributing alleles have tails that are 4 cm in length; mice with tails with 4 contributing alleles are 12 cm in length. Determine the phenotypic ratio from an F2 from a true breeding parent with 0 contributing alleles and a second true breeding parent with 4 contributing alleles.
ANSWER:
- A woman with type A blood marries a man with type B. They have three children; one has type O and the other 2 have type A. Determine the genotypes of the parents and the children.
ANSWER:
- In some varieties of squash, two genes (A and B) are involved in the expression of shape; each gene is completely dominant. Interaction between the two loci produces a new phenotype. Long fruit are homozygous recessive for both genes. Sphere shaped fruit are homozygous recessive for one of the genes, and have at least one dominant allele for the other gene. Finally, disk shaped fruit have at least one dominant allele for both genes. (8 pts)
- A cross between two sphere shaped fruit produces offspring in the proportions ¼ disk shaped, ½ sphere shaped, ¼ long. Determine the parents of this cross.
ANSWER:
- Cross a long fruited plant with a sphere shaped fruit that is heterozygous for the A gene and homozygous recessive for the B gene. List the proportions of the phenotypes you would expect.
ANSWER:
- A hypothetical alien trait is controlled by four different alleles of a single gene: a, a’, a’’ and A. An alien is a diploid organism.
The phenotype associated with the alleles is as follows:
A = 4 fingers
a” = 3 fingers
a’ = 2 fingers
a = 1 finger
The order of dominance of the alleles is A > a”> a’ > a. How many different genotypes are possible? List them. Give the phenotype for each genotype.
ANSWER:
- The allele for Tay Sachs disease is a recessive lethal allele in humans. Using a Punnett square, show how two normal parents could have a child with Tay Sachs. What is the probability of these two parents having a child with Tay Sachs?
ANSWER:
Homework Answers
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Assume that tail length in mice is a quantitative trait
involving two genes, each with 2...
1) Coat color in mice is determined by several independently assorting autosomal genes. Gene A is...
1) Coat color in mice is determined by several independently assorting autosomal genes. Gene A is involved in the distribution of pigment along the hair. A dominant allele (A) produces a hair color called "agouti"--the hair has dark pigment at the base and tip of each hair shaft and yellow pigment in the central portion of the shaft. Homozygous recessive mice (aa) are missing the yellow stripe and thus have solid dark-colored hair. Gene B is involved in the color...
46. (7 points) Vanessa has obtained two true-breeding strains of mice, each homozygous for an independently...
46. (7 points) Vanessa has obtained two true-breeding strains of
mice, each homozygous for an
independently discovered recessive mutation that prevents the
formation of hair on the body.
One of the mutant strains is called naked, and the other mutation
strain is called hairless. To
determine whether the two mutations are simply alleles for the same
gene, Vanessa crosses
naked and hairless mice with each other (cross 1). All the
offspring are phenotypically wild-
type.
A) What is the most...
5. Fur colour in mice is a single gene trait controled by two alleles. In a population of 75 mice, 21 are homozyg...
5. Fur colour in mice is a single gene trait controled by two alleles. In a population of 75 mice, 21 are homozygous dominant, 37 are heterozygous dominant, and 17 are homozygous recessive. What is the frequency of the dominant allele in the population? Show all work and record your answer as a value between O and 1 rounded to two decimal places 6. The Hardy-Weinberg principle states that allele and genotype frequencies remain constant from one generation to the...
A gene that affects more than one phenotype the combination of two alleles which comprise the gen...
match the mendelian genetics definition with the best
term
a gene that affects more than one phenotype the combination of two alleles which comprise the gene pair the allele that expresses itself at the expense of an alternate allele the form that is shown": it is the outward, physical appearance of a particular trait one alternative form of a given allelic pair the offspring of two parents that are homozygous for alternate alleles of a gene pair an individual heterozygous...
1.Certain characteristics, like coat color in many animals, is influenced by multiple genes. The phenomenon during...
1.Certain characteristics, like coat color in many animals, is influenced by multiple genes. The phenomenon during which the presence of a homozygous recessive genotype at one locus "overrides" or masks the phenotype that would otherwise be produced by the alleles at another locus (regardless of whether they are dominant or recessive) is called: pleiotropy codominance Punnett effect recessive Epistasis 2. Which of the following would be considered a pleiotropic gene? A gene that-along with several others-influences a single phenotype, such...
In mice, the dominant allele Gs of the X-linked gene Greasy produces shiny fur, while the...
In mice, the dominant allele Gs of the X-linked gene Greasy produces shiny fur, while the recessive wild type Gs+ allele determines normal fur. The dominant allele Bhd of the X-linked Broadhead gene causes skeletal abnormalities including broad heads and snouts, while the recessive wild-type Bhd+ allele yields normal skeletons. Female mice heterozygous for the two alleles of both genes were mated with wild-type males. Among 100 male progeny of this cross, 49 had shiny fur, 48 had skeletal abnormalities,...
In mice, the gene for tail length has 2 alleles: short is dominant to long. However,...
In mice, the gene for tail length has 2 alleles: short is dominant to long. However, short tail is lethal in the homozygous condition. A short tail mouse is crossed to a long tail mouse. What are the expected phenotype's and their ratios of the mouse pups in this litter? options: 25% long tails 75% long tails 100% long tails No long tails 50% long tails 33% long tails 67% long tails Following up to the previous question, 2 short...
The genes for sepia eye color, short bristles, and dark body coloration are on the same...
The genes for sepia eye color, short bristles, and dark body coloration are on the same chromosome of Drosophila melanogaster. Each gene has two alleles: wild type, which is dominant, or mutant, which is recessive. se+ is dominant and causes red eyes; se is recessive and causes sepia eyes sb+ is dominant and causes long bristles; sb is recessive and causes short bristles b+ is dominant and causes gray body coloration; b is recessive and causes dark...
11. You are a researcher studying mice. You hypothesize allele, brown coat; B-dominant allele, black coat)...
11. You are a researcher studying mice. You hypothesize allele, brown coat; B-dominant allele, black coat) and tail length (I recessive allele, shor allele, long tail) in mice are independently assorted. You know that both genes are autosomai gen. Youhve that genes that control coat color (b - recessive tail, L-dominant colonies of true- Obreeding access to two with short tails and brown coats. You cross the females and males described above and then you cross the F1s. Your aggregated...
BIO340 Recitation 5 Spring 2020 Your professor is having you look at two genes in Drosophila...
BIO340 Recitation 5 Spring 2020 Your professor is having you look at two genes in Drosophila fruit flies to determine experimentally whether they are linked. One trait is eye color and two alleles are present at the gene: se+ is the wild-type allele for red eyes, and se is the mutant, recessive allele for sepia eyes. The second trait is body color and two alleles are present at this gene: e+ is the wild-type allele for grey body, and e...
46. (7 points) Vanessa has obtained two true-breeding strains of
mice, each homozygous for an
independently discovered recessive mutation that prevents the
formation of hair on the body.
One of the mutant strains is called naked, and the other mutation
strain is called hairless. To
determine whether the two mutations are simply alleles for the same
gene, Vanessa crosses
naked and hairless mice with each other (cross 1). All the
offspring are phenotypically wild-
type.
A) What is the most...
5. Fur colour in mice is a single gene trait controled by two alleles. In a population of 75 mice, 21 are homozygous dominant, 37 are heterozygous dominant, and 17 are homozygous recessive. What is the frequency of the dominant allele in the population? Show all work and record your answer as a value between O and 1 rounded to two decimal places 6. The Hardy-Weinberg principle states that allele and genotype frequencies remain constant from one generation to the...
match the mendelian genetics definition with the best
term
a gene that affects more than one phenotype the combination of two alleles which comprise the gene pair the allele that expresses itself at the expense of an alternate allele the form that is shown": it is the outward, physical appearance of a particular trait one alternative form of a given allelic pair the offspring of two parents that are homozygous for alternate alleles of a gene pair an individual heterozygous...
11. You are a researcher studying mice. You hypothesize allele, brown coat; B-dominant allele, black coat) and tail length (I recessive allele, shor allele, long tail) in mice are independently assorted. You know that both genes are autosomai gen. Youhve that genes that control coat color (b - recessive tail, L-dominant colonies of true- Obreeding access to two with short tails and brown coats. You cross the females and males described above and then you cross the F1s. Your aggregated...
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