Genetics: From Genes to Genomes
6th Edition
ISBN: 9781259700903
Author: Leland Hartwell Dr., Michael L. Goldberg Professor Dr., Janice Fischer, Leroy Hood Dr.
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 3, Problem 14P
In clover plants, the pattern on the leaves is determined by a single gene with multiple alleles that are related in a dominance series. The gene is not pleiotropic. Seven different alleles of this gene are known; an allele that determines the absence of a pattern is recessive to the other six alleles, each of which produces a different pattern. All heterozygous combinations of alleles show complete dominance.
a. | How many different kinds of leaf patterns(including the absence of a pattern) are possible in a population of clover plants in which all seven alleles are represented? |
b. | What is the largest number of different genotypes that could be associated with any one |
c. | In a particular field, you find that the large majority of clover plants lack a pattern on their leaves, even though you can identify a few plants representative of all possible patterns. Explain this finding. |
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In clover plants, the pattern on the leaves is determined by a single gene with multiple alleles that arerelated in a dominance series. The gene is not pleiotropic. Seven different alleles of this gene are known;an allele that determines the absence of a pattern isrecessive to the other six alleles, each of which produces a different pattern. All heterozygous combinations of alleles show complete dominance.a. How many different kinds of leaf patterns (including the absence of a pattern) are possible in a population of clover plants in which all seven allelesare represented?b. What is the largest number of different genotypesthat could be associated with any one phenotype?Is there any phenotype that could be represented byonly a single genotype?c. In a particular field, you find that the large majority of clover plants lack a pattern on their leaves,even though you can identify a few plants representative of all possible pattern types. Explain thisfinding.
Black fur is dominant over gray. If a father is heterozygous dominant and the mother is homozygous recessive,
a1. what are the genotype probabilities of their offspring?
a2. what are the phenotype probabilities of their offspring?
Phenotypic ratio:
red :
pink :
white
Solve the following genetic problems involving incomplete dominance. You
must pick the right letter to represent the gene in the question. You must show
your work using the Punnett square.
15. A rooster with grey feathers is mated with a hen of the same phenotype. Among their
offspring 15 chicks are grey, 6 are black and 8 are white.
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b. What offspring would you expect from the mating of a grey rooster and a black hen?
Chapter 3 Solutions
Genetics: From Genes to Genomes
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Ch. 3 - Alleles of the gene that determines seed coat...Ch. 3 - One of your fellow students tells you that there...Ch. 3 - In a population of rabbits, you find three...Ch. 3 - In clover plants, the pattern on the leaves is...Ch. 3 - Fruit flies with one allele for curly wings Cy and...Ch. 3 - In certain plant species such as tomatoes and...Ch. 3 - In a species of tropical fish, a colorful orange...Ch. 3 - People heterozygous for normal and nonfunctional...Ch. 3 - Using old Fugate family Bibles and the Perry...Ch. 3 - A rooster with a particular comb morphology called...Ch. 3 - A black mare was crossed to a chestnut stallion...Ch. 3 - Filled-in symbols in the pedigree that follows...Ch. 3 - You perform a cross between two true-breeding...Ch. 3 - a. How would you describe inheritance of flower...Ch. 3 - Suppose the intermediate called Colorless...Ch. 3 - Explain the difference between epistasis and...Ch. 3 - The dominant allele H reduces the number of body...Ch. 3 - Secretors genotypes SS and Ss secrete their A and...Ch. 3 - Normally, wild violets have yellow petals with...Ch. 3 - A woman who is blood type B has a child whose...Ch. 3 - The following table shows the responses of blood...Ch. 3 - Three different pure-breeding strains of corn that...Ch. 3 - In mice, the AY allele of the agouti gene is a...Ch. 3 - A student whose hobby was fishing pulled a very...Ch. 3 - Suppose that blue flower color in a plant species...Ch. 3 - This problem examines possible biochemical...Ch. 3 - Considering your answers to Problem 36, does the...Ch. 3 - You picked up two mice one female and one male...Ch. 3 - Figure 3.21 and Fig. 3.28b both show traits that...Ch. 3 - Three genes in fruit flies affect a particular...Ch. 3 - The garden flower Salpiglossis sinuata painted...Ch. 3 - In foxgloves, three different petal phenotypes...Ch. 3 - In a culture of fruit flies, matings between any...Ch. 3 - Prob. 44PCh. 3 - A couple wants to know the probability that their...Ch. 3 - This problem illustrates why classical geneticists...Ch. 3 - Prob. 47PCh. 3 - Familial hypercholesterolemia FH is an inherited...Ch. 3 - You have come into contact with two unrelated...Ch. 3 - Polycystic kidney disease is a dominant trait that...Ch. 3 - Identical monozygotic twins have similar, but not...Ch. 3 - Using each of the seven coat color genes discussed...
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- The clamshell orchid can have a dorsal sepal that is either bright purple (P) or yellow (Y), and may have ventral sepals that are curly (C) or flat (F). Assume that each trait is caused by a single gene in which one allele is completely dominant to the other and that these genes are independently assorting. Look at the table 1 below and determine the dominant and recessive alleles for sepal colour and shape. Table 1: resulting offspring produced by mating parents of the indicated phenotypes Cross 1 Cross 2 Cross 3 Parent 1 Purple, curly Purple, flat Purple, curly Parent 2 Yellow, flat Offspring Phenotypes Purple, curly 11 Purple, flat 20 Yellow, flat 0 Purple, flat Which shape phenotype is recessive? 9 59 43 X Yellow, curly 12 7 0 Yellow, flat 11 Based on the information shown in the table above, determine the dominant and recessive alleles for colour and shape. Complete the information asked below: Which colour phenotype is recessive? 22 0 Choose appropriate symbols (basic…arrow_forwardColored aleurone in the kernels of corn is due to the dominant allele R. The recessive allele r, when homozygous, produces colorless aleurone. The plant color (not the kernel color) is controlled by another gene with two alleles, Y and y. The dominant Y allele results in green color, whereas the homozygous presence of the recessive y allele causes the plant to appear yellow. In a testcross between a plant of unknown genotype and phenotype and a plant that is homozygous recessive for both traits, the following progeny were obtained: colored, green 88 colored, yellow 12 colorless, green 8 colorless, yellow 92 Explain how these results were obtained by determining the exact genotype and phenotype of the unknown plant, including the precise arrangement of the alleles on the homologs.arrow_forwardThe gene for lengths of stem in a garden pea plant results in either tall or short stems, with tall being the dominant trait. Pretend you are a geneticist and, for the purpose of an investigation, you would like to determine if a tall pea plant is homozygous dominant or heterozygous. Explain your reasoning using Punnett squares. Be sure to give the expected results of each Punnett Square you draw.arrow_forward
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