BROOKER BIOLOGY
5th Edition
ISBN: 9781307656152
Author: BROOKER
Publisher: MCG/CREATE
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Chapter 18.6, Problem 1CC
Summary Introduction
To determine: The fly in which crossing over occurs to produce the recombinant offsprings in the F2 generation.
Introduction: During reproduction, the next generation inherits the parental traits. However, some new features are also seen in the offsprings. Linkage and crossing over are two phenomena that are responsible for the development of parental and recombinant types.
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A homozygous tomato plant with orange fruit and white flowers was crossed with a homozygous tomato plant with red fruit and red flowers. The F1 all had orange fruit and white flowers. The F1 were testcrossed by crossing them to homozygous recessive individuals and the following offspring were obtained:
Orange fruit and white flowers- 64
Red fruit and red flowers- 69
Orange fruit and red flowers- 14
Red fruit and white flowers- 13
What is the recombination frequency of these two genes?
If the genes are not assorting independently, what is the recombinationfrequency between them?
Wild-type mice have brown fur and short tails. Loss of function of a particular gene
produces white fur, while loss of function of another gene produces long tails, and loss
of function at a third locus produces agitated behavior. Each of these loss of function
alleles is recessive. If a wild-type mouse is crossed with a triple mutant, and their F1
progeny is test-crossed, the following recombination frequencies are observed among
their progeny. Produce a genetic map for these loci.
Brown, short tailed, normal: 955
White, short tailed, normal:
16
Brown, short tailed, agitated: 0
White, short tailed, agitated: 36
Brown, long tailed, normal:
White, long tailed, normal:
Brown, long tailed, agitated:
46
0
14
White, long tailed, agitated: 933
Chapter 18 Solutions
BROOKER BIOLOGY
Ch. 18.2 - Prob. 1CCCh. 18.3 - Prob. 1CCCh. 18.3 - Prob. 1CSCh. 18.5 - Prob. 1CSCh. 18.5 - Prob. 1CCCh. 18.6 - Prob. 1EQCh. 18.6 - Prob. 2EQCh. 18.6 - Prob. 3EQCh. 18.6 - Prob. 1CCCh. 18.6 - Prob. 2CC
Ch. 18 - Which of the following is an example of an...Ch. 18 - Prob. 2TYCh. 18 - A female mouse that is Igf2 Igf2 is crossed to a...Ch. 18 - Prob. 4TYCh. 18 - Prob. 5TYCh. 18 - Prob. 6TYCh. 18 - Prob. 7TYCh. 18 - Prob. 8TYCh. 18 - Based on the ideas proposed by Morgan, which of...Ch. 18 - Extranuclear inheritance occurs because a. certain...Ch. 18 - Define epigenetics. Are all epigenetic changes...Ch. 18 - What is a Barr body? How is its structure...Ch. 18 - Core Concept: Information A core concept of...Ch. 18 - Prob. 1COQCh. 18 - Mendel studied seven traits in garden pea plants,...
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- You are working with a hypothetical fly and have found color and wing mutants. Preliminary work indicates that the mutant traits are recessive and the associated genes are not sex-linked, but beyond that, you have no information. You first look at 2 genes, each with 2 alleles. "B" or “b" for body color and "W" or "w" for wing surface. The red-body phenotype is dominant to the yellow-body phenotype and smooth wings are dominant to crinkled wings.arrow_forwardIn the mapping example in Fig 2, the dominant alleles were on one chromosome and the recessive alleles were on the homolog. Let’s consider a twofactor cross in which the dominant allele for one gene is on onechromosome, but the dominant allele for a second gene is on thehomolog. A cross is made between AAbb and aaBB parents. The F1offspring are AaBb. The F1 heterozygotes are then testcrossed to aabbindividuals. Which F2 offspring are recombinant?arrow_forwardIn the mapping example in Fig 2, the dominant alleles were on one chromosome and the recessive alleles were on the homolog. Let’s consider a twofactor cross in which the dominant allele for one gene is on onechromosome, but the dominant allele for a second gene is on thehomolog. A cross is made between AAbb and aaBB parents. The F1offspring are AaBb. The F1 heterozygotes are then testcrossed to aabbindividuals. What topic in genetics does this question address?arrow_forward
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