Introduction to Genetic Analysis
Introduction to Genetic Analysis
11th Edition
ISBN: 9781464109485
Author: Anthony J.F. Griffiths, Susan R. Wessler, Sean B. Carroll, John Doebley
Publisher: W. H. Freeman
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Chapter 3, Problem 25P

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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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.
What would justify the following ratio appearing after phenotyping the outcome of a crossing trial: 8.9: 2.9: 3.2:1? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a b C d Obviously this represents independent assortment based on crossing dihybrid heterozygotes. Obviously this represents gene linkage based on test crossing a dihybrid heterozygote. Obviously this represents the results of a trihybrid test cross. Obviously this represents independent assortment based on crossing monohybrid heterozygotes.
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?
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How to solve genetics probability problems; Author: Shomu's Biology;https://www.youtube.com/watch?v=R0yjfb1ooUs;License: Standard YouTube License, CC-BY
Beyond Mendelian Genetics: Complex Patterns of Inheritance; Author: Professor Dave Explains;https://www.youtube.com/watch?v=-EmvmBuK-B8;License: Standard YouTube License, CC-BY