INTRO TO GEN ANALYSIS W/ACHIEVE ACCESS
INTRO TO GEN ANALYSIS W/ACHIEVE ACCESS
12th Edition
ISBN: 9781319423865
Author: Griffiths
Publisher: MAC HIGHER
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Chapter 3, Problem 37P

a.

Summary Introduction

To determine: The different genotypes that can be seen in the grid of 16 squares.

Introduction: Mendel discovered most commonly two types of crosses based on the number of characters studied at a time. The cross can be monohybrid, dihybrid.

b.

Summary Introduction

To determine: The phenotype of the genotype obtained in the given cross.

Introduction: The given genotypic ratio of the cross 9:3:3:1 is obtained when a plant with two characters are crossed and are studied at a same time.

c.

Summary Introduction

To determine: The formula that can depict the number of genotype in the given cross.

Introduction: The different crosses, whether monohybrid, dihybrid or any other cross will result in the different number of genotypes which represent the different combinations of genes.

d.

Summary Introduction

To determine: The different genotypes that will represent the similar phenotype.

Introduction: The genotype represents the genetic composition which further depicts the phenotype of that individual.

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A dihybrid testcross is made to determine if genes C and D are linked. The results are shown in the table. 1. The chi-square value is the sum for all progeny classes of (observed-expected)2/expected. Using the chi-square test for goodness of fit, calculate the chi-square value to test the null hypothesis that genes C and D are unlinked. What is the chi-square value? 2. Using the chi-square test for goodness of fit, how many degrees of freedom are in this data set? 3. Using table 5.2 find the most accurate range within which the p value falls. 4. What is a reasonable conclusion based on the chi-square analysis?
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 following Test Cross results & chromosome map: Test Cross Progeny 525 A   B  C 500 A+ B+C+ 456 A+ B C 308 A  B+C+ 101 A  B  C+ 100 A+ B+C 2 A+ B C+ 1 A  B+C Total Progeny = 1993   1-Based on the above data calculate the expectednumber of Double crossovers (DCOs)? Round answers to the closest whole number.

Chapter 3 Solutions

INTRO TO GEN ANALYSIS W/ACHIEVE ACCESS

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