Genetic Analysis: An Integrated Approach (3rd Edition)
3rd Edition
ISBN: 9780134605173
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter 19, Problem 29P
A three-gene system of additive genes (A, B, and C) controls plant height. Each gene has two alleles (A and a, B and b, and C and c). There is dominance among the alleles of each gene, with alleles A, B, and C dominant over a, b and c. Under this scheme, the dominant genotype for a gene contributes
a. What is the height potential of a plant that is homozygous for all three dominant alleles?
b. What is the height potential of a plant that is homozygous for all three recessive alleles?
c. What is the height potential of the
d. What are the
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The shape of a pumpkin is determined by the action of two genes A and B. The recessive forms of these two alleles produces a flattened-shaped fruit, whereas the dominant forms of these two alleles produce the typical pumpkin with ridges. When both alleles are heterozygous a disc-shaped pumpkin is produced. If the genotype of the pumpkin plant is homozygous dominant at one allele and heterozygous at the other, the pumpkin will be ball-shaped. If the pumpkin plant is homozygous recessive at one allele and heterozygous at the other allele it produces an oblong-shaped fruit. Plants with genotypes other than the ones listed in this question do not produce pumpkins. Do the following cross: two pumpkin plants capable of making disc-shaped pumpkins are crossed with each other. Based on this cross, answer the following: (Show your work below.)
How many of the progeny will make ball-shaped pumpkins?__________________________________________
How many of the progeny will make disc-shaped…
In garden pea plants, tall stem height (T) is dominant over short stem height (t), and green pod colour (G) is dominant over yellow pod colour (g).
Some Genotypes of Pea Plants
TTGG
TTGg
TTgg
TtGG
TtGg
Ttgg
ttGG
ttGg
ttgg
Identify the correct genotypes listed above for the pea plant phenotypes described below.
Phenotype
Number
Pure breeding tall, green pod pea plant
Answer
Pea plant used for a test cross
Answer
Heterozygous tall and green pod pea plant
Answer
Yellow pod heterozygous tall pea plant
Answer
In com, colored aleurone (in the kernels) 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.
Numbers of Offspring
Phenotype
Colored Aleurone & Green Plant
88
Colored Aleurone & Yellow Plant
12
Colorless Aleurone & Green Plant
8
Colorless Aleurone & Yellow Plant
92
Question:
Determine the genotype and phenotype of the unknown plant, including the precise
association of the two genes on the homologs (i.e. the map arrangement)
Chapter 19 Solutions
Genetic Analysis: An Integrated Approach (3rd Edition)
Ch. 19 - Which of the following traits would you expect to...Ch. 19 - 19.2 For the traits listed in the previous...Ch. 19 - Compare and contrast broad sense heritability and...Ch. 19 - 19.4 In a cross of two pure-breeding lines of...Ch. 19 - 19.5 Describe the difference between continuous...Ch. 19 - Prob. 6PCh. 19 - 19.7 Provide a definition and an example for each...Ch. 19 - 19.8 What is a random sample, and why can a random...Ch. 19 - 19.9 Why is heritability an important phenomenon...Ch. 19 - 19.10 Three pairs of genes with two alleles each (...
Ch. 19 - 19.11 In selective breeding experiments, it is...Ch. 19 - 19.12 Two inbred lines of sunflowers produce...Ch. 19 - What is quantitative trait locus (QTL)? Suppose...Ch. 19 - 19.14 In Nicotiana, two inbred strains produce...Ch. 19 - 19.15 Suppose the length of maize ears has narrow...Ch. 19 - In a line of cherry tomatoes, the average fruit...Ch. 19 - 19.17 Two purebreeding wheat strains, one...Ch. 19 - Prob. 18PCh. 19 - During a visit with your grandparents, they...Ch. 19 - 19.20 An association of racehorse owners is...Ch. 19 - Prob. 21PCh. 19 - Suppose a polygenic system for producing color in...Ch. 19 - New Zealand lamb breeders measure the following...Ch. 19 - Cattle breeders would like to improve the protein...Ch. 19 - In human gestational development, abnormalities of...Ch. 19 - The children of couples in which one partner has...Ch. 19 - Answer the following in regard to multifactorial...Ch. 19 - 19.28 Suppose the mature height of a plant is a...Ch. 19 - A three-gene system of additive genes (A, B, and...Ch. 19 - 19.30 Congenital dislocation of the hip is a...Ch. 19 - A total of 20 men and 20 women volunteer to...
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