IA MODIFIED MASTERING BIOLOGY WITH E TEX
IA MODIFIED MASTERING BIOLOGY WITH E TEX
12th Edition
ISBN: 9780136781752
Author: Urry
Publisher: PEARSON
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Chapter 15, Problem 5TYU
Summary Introduction

To calculate: The recombination frequency of given genes.

Introduction: Test cross is defined as a method used to find out the genotype of any plant with the dominant character when it is not known whether it is homozygous or heterozygous for the trait.

Recombination frequency is used to find the linkage between the genes.

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You have determined that the gene order for three linked genes being studied is A B C. The number of recombinants resulting from crossover between genes A and BC are 44 and 48, respectively, while the double-crossover progeny total 4 and 6. What is the recombination frequency between genes A and B if the total progeny from the cross is 1000? Show all of your work.
Consider the recombination frequencies data below from a series of two-point crosses that were carried out for genes found at seven loci (a, b, c, d, e, f, and g). Use this data to answer the following questions. The seven genes above are found on how many linkage groups? Loci a and b a and c a and d a and e a and f a and g b and c b and d b and e b and f b and g a. 7 linkage groups b. 5 linkage groups c. 4 linkage groups O d. 3 linkage groups % Recombination 50 50 50 50 50 50 50 50 50 29 11 Loci c and d c and e c and f c and g d and e d and f d and g e and f e and g fand g % Recombination 29 41 50 50 12 50 50 50 50 18 (1)
Cougar coat color and eye color are determined by two genes on the same chromosome, gene C and gene E. Gene C has two alleles: the dominant allele C produces wild type (tan) coats and the recessive allele c produces white coats. Gene E has two alleles: the dominant allele E produces wild type (brown eyes) and the recessive allele e confers blue eyes. To determine the recombination rate between these two loci you cross a wild-type cougar (CCEE) to a white-coated, blue-eyed cougar to produce a diheterozygous male cougar (CcEe). You then mate F1 male to a series of white-coated, blue-eyed  female cougars to produce a panel of F2 offspring in the table below. What is the recombination rate between the two loci? Express your answer in map units, rounded to the nearest integer.  phenotype number of F1 offspring tan coat, brown eyes 200 tan coat, blue eyes 50 white coat, blue eyes 201 white coat, brown eyes 55

Chapter 15 Solutions

IA MODIFIED MASTERING BIOLOGY WITH E TEX

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