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 2, Problem 11P
Some inbred strains of the weedy plant Arabidopsis thaliana flower early in the growing season, but other strains flower at later times. Four different Arabdiposis plants (1–4) were crossed, and the resulting progeny were tabulated as follows:
Mating | Progeny |
1×2 | 77 late : 81 early |
1×3 | 134 late |
1×4 | 93 late : 32 early |
2×3 | 111 late |
2×4 | 65 late : 61 early |
3×4 | 126 late |
a. | Explain the genetic basis for the difference in flowering time. How do you know that among this group of plants, the flowering time trait is influenced by the action of a single gene? Which allele is dominant and which recessive? |
b. | Ascribe genotypes to the four plants. |
c. | What kinds of progeny would you expect if you allowed plants 1–4 to self-fertilize, and in what ratios? |
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three recessive genes a, b, and c in the model plant Arabidopsis are found to be linked on chromosome 4. A three point test cross is done with a homozygous recessive plant with a heterozygous for all three genes. Following is the number of progenies
a b C 65
A B c 56
A B C 1267
a b c 1310
A b C 550
a B c 515
a B C 470
A b c 489
Total = 4,722
Determine the middle locus by your choice of method and after that calculate the map distance between the genes in map unit (m.u.).
In Primula vulgaris (primrose), purple flowers are dominant to white flowers, and short plants
are dominant to tall plants. The genes controlling these two traits are on different
chromosomes. You cross a true-breeding purple, short plant with a true-breeding white, tall
plant and then intercross the resulting F1 offspring. In the F2 offspring, you find the following
phenotypes:
Purple, short
Purple, tall
608
161
White, short
White, tall
173
58
With your knowledge of the x' test, you will determine whether the outcomes of the F1
intercross corresponds to expectations based on Mendelian genetics.
1. What is your null hypothesis for the outcome of the F1 intercross? Write it here:
2. Based on your null hypothesis, how many individuals do you expect in each of the phenotypic
classes? Write your expectations below.
Purple, short
Purple, tall
White, short
White, tall
3. What are the degrees of freedom for this test? Write your answer here:
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and determine the genotypes of the parental individuals, which are from pure-
breeding lines.
CROSS 1
CROSS 2
purple X colorless
all purple
9/16 purple
colorless X red
all purple
as in Cross 1
F1
F1
F2
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3/16 red
4/16 colorless
Chapter 2 Solutions
Genetics: From Genes to Genomes
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