Principles of Biology
Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 16, Problem 9TY
Summary Introduction

Introduction:

Thomas Hunt Morgan was a biologist, geneticist, embryologist, and science writer and received the Nobel Prize in Physiology or Medicine for his discovery of the chromosome and their importance in heredity.

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A researcher hypothesizes that, in mice, two autosomal dominant traits, trait Q and trait R, are determined by separate genes found on the same chromosome. The researcher crosses mice that are heterozygous for both traits and counts the number of offspring with each combination of phenotypes. The total number of offspring produced was 64. The researcher plans to do a chi-square analysis of the data and calculates the expected number of mice with each combination of phenotypes. Which of the following is the expected number of offspring that will display both trait Q and trait R?     a.4   b.12   c.36   d.48
Which of the following statements is TRUE?     Positive interference occurs when a crossover in one region of a chromosome interferes with crossovers in nearby regions.     The higher the coefficient of coincidence, the higher the degree of interference.      Linked genes always exhibit recombination frequencies of greater than 50%.     Two genes that are located far from each other on the same chromosome will show a lower frequency of recombination than two genes that are close together on the chromosome.     Recombination mapping experiments become more accurate as the distance between genes increases.
Which of the following statements are true regarding the F2 offspring of a mapping cross for three genes on the same chromosome? Recombinant allelic combinations will occur less frequently when genes are further apart. assuming all three genes are genetically linked, the most common classes of F2 offspring will be those containing parental allelic combinations the recombination rate calculated between any pair of genes will never exceed 50% F2 offspring will tend to inherit all dominant or all recessive alleles from the triheterozygous parent the alleles bf each gene willassort independently making parental and recombinant allelic combinations equally likely among the F2. double recombinant offspring will be the rarest class
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