ND STONY BROOK UNIVERSITY LOOSELEAF GENETICS: FROM GENES TO GENOMES
6th Edition
ISBN: 9781260406092
Author: HARTWELL, Leland, HOOD, Leroy, Goldberg, Michael
Publisher: Mcgraw-hill Education/stony Brook University
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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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Some inbred strains of the weedy plant Arabidopsisthaliana flower early in the growing season, but otherstrains flower at later times. Four different Arabdiposisplants (1–4) were crossed, and the resulting progenywere tabulated as follows:Mating Progeny1 × 2 77 late : 81 early1 × 3 134 late1 × 4 93 late : 32 early2 × 3 111 late2 × 4 65 late : 61 early3 × 4 126 latea. Explain the genetic basis for the difference in flowering time. How do you know that among thisgroup of plants, the flowering time trait is influenced by the action of a single gene? Which alleleis 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?
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:
In a diploid plant species, an F1 with the genotype Gg Ll Tt is test-crossed to a pure-breeding recessive plant with the genotype gg ll tt. The offspring genotypes are listed in the table.
Genotype
Number
Gg Ll Tt
621
Gg Ll tt
3
Gg ll Tt
64
Gg ll tt
109
gg Ll Tt
103
gg Ll tt
67
gg ll Tt
7
gg ll tt
626
1600
Calculate the recombination frequency between G and T pair of genes.
A.
0.227
B.
0.139
C.
0.454
D.
0.233
Chapter 2 Solutions
ND STONY BROOK UNIVERSITY LOOSELEAF GENETICS: FROM GENES TO GENOMES
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