Concepts of Genetics (12th Edition)
12th Edition
ISBN: 9780134604718
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino, Darrell Killian
Publisher: PEARSON
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Chapter 25, Problem 26ESP
Summary Introduction
To determine: The number of offsprings that contains two uppercase alleles in a cross of AaBbCc×AaBbCc.
Introduction: A true-breeding plant, AABBCC crossed with another true-breeding plant, aabbcc which result in AaBbCc offspring. True-breeding is a type of breeding in which the offspring carry the same
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Practice Problem:
You cross a true-breeding pea plant with red flowers to a true-breeding pea plant with white
flowers. All of your offspring have red flowers. Which gene is dominant? Why? What is the
genotype of your offspring?
You then cross the offspring to each other. What ratio do you expect? Why?
You count 1000 plants and look at their flowers. Your results are as follows:
740 red
260 white
Does this follow a simple Mendelian inheritance pattern? Why or why not?
DADT 2
MEA SUDI
ND D LUT IONS
Consider a two-factor cross between a pure breeding plants: one with purple flowers and yellow seed pods and another with white flowers and green seed pods. 100% of F1 offspring have purple flowers and green seed pods. If these F1 plants are self-fertilized, what proportion of F2 offspring are expected to have purple flowers and green seed pods? You may assume independent assortment of the flower color and seed pod color alleles. Please give your answer as a decimal rounded to two decimal places (e.g. 0.69).
Two pure-breeding lines of petunia plants are crossed. Line 1 plants grow to a height of 54
cm, and Line 2 plants grow to a height of 18 cm. Petunia plant height is controlled by three
genes, A, B and C. Line 1 has the genotype A₁A₁B₁B₁C₁C₁, and line 2 has the genotype
A2A2B₂B₂C₂C₂. Assume that genotype alone determines plant height under ideal growth
conditions and that the alleles of the three genes are additive.
If the F1 plants are self crossed, what is the expected proportion of F2 plants with the
genotype A₁A₁B₁B₁C₁C₁
1/8
1/32
1/16
1/4
1/64
Chapter 25 Solutions
Concepts of Genetics (12th Edition)
Ch. 25 - A homozygous plant with 20-cm-diameter flowers is...Ch. 25 - The following table shows measurements for fiber...Ch. 25 - The following cable gives the percentage of twin...Ch. 25 - At an interview with a genetic counselor, a couple...Ch. 25 - Prob. 2CSCh. 25 - At an interview with a genetic counselor, a couple...Ch. 25 - HOW DO WE KNOW? In this chapter, we focused on a...Ch. 25 - CONCEPT QUESTION Review the Chapter Concepts list...Ch. 25 - Define the following: (a) polygenic, (b) additive...Ch. 25 - A dark-red strain and a white strain of wheat are...
Ch. 25 - Height in humans depends on the additive action of...Ch. 25 - An inbred strain of plants has a mean height of 24...Ch. 25 - Erma and Harvey were a compatible barnyard pair,...Ch. 25 - In the following table, average differences of...Ch. 25 - What kind of heritability estimates (broad sense...Ch. 25 - List as many human traits as you can that are...Ch. 25 - Corn plants from a test plot are measured, and the...Ch. 25 - The following variances were calculated for two...Ch. 25 - The mean and variance of plant height of two...Ch. 25 - Prob. 14PDQCh. 25 - Prob. 15PDQCh. 25 - In an assessment of learning in Drosophila, flies...Ch. 25 - Prob. 17PDQCh. 25 - Prob. 18PDQCh. 25 - In a population of 100 inbred, genotypically...Ch. 25 - Many traits of economic or medical significance...Ch. 25 - A 3-inch plant was crossed with a 15-inch plant,...Ch. 25 - In a cross between a strain of large guinea pigs...Ch. 25 - Type A1B brachydactyly (short middle phalanges) is...Ch. 25 - In a series of crosses between two true-breeding...Ch. 25 - Students in a genetics laboratory began an...Ch. 25 - Prob. 26ESPCh. 25 - Canine hip dysplasia is a quantitative trait that...Ch. 25 - Floral traits in plants often play key roles in...Ch. 25 - In 1988, Horst Wilkens investigated blind...
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- Assume that the length of a type of cucumber at maturity is controlled by two genes (A and B), each of which has two alleles. The A and B alleles each add 3 inches of cucumber growth, while the a and b alleles add only 1 inches. If a plant with genotype AABb is crossed to a plant with genotype AaBb, what ratio of lengths are expected in the progeny? 1/8-12”, 3/8-10”, 3/8-8”, 1/8-6” 1/2-8”, 3/8-6”, 1/8 4” 1/2-10”, 3/8-8”, 1/8 6” 1/2-12”, 3/8-10”, 1/8 8” 1/8-10”, 3/8-8”, 3/8-6”, 1/8-4”arrow_forwardYou have a pure breeding plant with red flowers, yellow seeds and red-veined leaves. You cross this with another pure breeding plant that has white flowers, pink seeds and yellow leaf veins. All of the offspring (F1) have white flowers, yellow seeds and orange leaf veins. Assuming all three loci are independently assorting, use this information to answer the following question: If two F1 offspring are crossed with each other and 1000 F2 are obtained, approximately how many offspring should have orange leaf veins? a. 1000 b. 750 c. 500 d. 250 e. Cannot be determined with this informationarrow_forwardTwo true-breeding pea plants are crossed. One parent is round, terminal, violet, constricted, while the other expresses the con- trasting phenotypes of wrinkled, axial, white, full. The four pairs of contrasting traits are controlled by four genes, each located on a separate chromosome. In the F1 generation, only round, axial, violet, and full are expressed. In the F2 generation, all possible combinations of these traits are expressed in ratios consistent with Mendelian inheritance.(a) What conclusion can you draw about the inheritance of these traits based on the F1 results?(b) Which phenotype appears most frequently in the F2 results? Write a mathematical expression that predicts the frequency of occurrence of this phenotype.(c) Which F2 phenotype is expected to occur least frequently? Write a mathematical expression that predicts this frequency.(d) How often is either P1 phenotype likely to occur in the F2 generation?(e) If the F1 plant is testcrossed, how many different pheno-…arrow_forward
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