ESSENTIALS OF GENETICS ALC & MOD MSTG/ET VP
1st Edition
ISBN: 9780134452890
Author: KLUG
Publisher: Pearson Education
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Chapter 7, Problem 5PDQ
Why is a 50 percent recovery of single-crossover products the upper limit, even when crossing over always occurs between two linked genes?
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WHY IS A 50% RECOVERY OF SINGLE-CROSSOVER PRODUCTS THE UPPER LIMIT, EVEN WHEN CROSSINGOVER ALWAYS OCCURS BETWEEN TWO LINKED GENES?
Explain why a 50 percent recovery of single-crossover products is the upper limit, even when crossing over always occurs between two linked genes?
Why does the presence of double crossovers allow for underestimation of recombinant frequency?
Chapter 7 Solutions
ESSENTIALS OF GENETICS ALC & MOD MSTG/ET VP
Ch. 7 -
CASE STUDY | Links to autism
As parents of an...Ch. 7 -
CASE STUDY | Links to autism
As parents of an...Ch. 7 - CASE STUDY | Links to autism As parents of an...Ch. 7 -
CASE STUDY | Links to autism
As parents of an...Ch. 7 -
HOW DO WE KNOW?
1. In this chapter, we focused on...Ch. 7 -
CONCEPT QUESTION
2. Review the Chapter Concepts...Ch. 7 - Describe the cytological observation that suggests...Ch. 7 - Why does more crossing over occur between two...Ch. 7 - Why is a 50 percent recovery of single-crossover...Ch. 7 - Why are double-crossover events expected less...
Ch. 7 - What is the proposed basis for positive...Ch. 7 - What three essential criteria must be met in order...Ch. 7 - The genes dumpy wings (dp), clot eyes (cl), and...Ch. 7 - Colored aleurone in the kernels of corn is due to...Ch. 7 - In the cross shown here, involving two linked...Ch. 7 - In a series of two-point map crosses involving...Ch. 7 -
13. Two different female Drosophila were...Ch. 7 -
14. In Drosophila, a cross was made between...Ch. 7 -
15. A cross in Drosophila involved the recessive,...Ch. 7 -
16. Drosophila melanogaster has one pair of sex...Ch. 7 -
17. Drosophila females homozygous for the third...Ch. 7 - In Drosophila, the two mutations Stubble bristles...Ch. 7 -
19. A female of genotype
produces 100 meiotic...Ch. 7 - In a plant, fruit color is either red or yellow,...Ch. 7 - In Drosophila, Dichaete (D) is a mutation on...Ch. 7 - An organism of the genotype AaBbCc was testcrossed...Ch. 7 - Based on our discussion of the potential...Ch. 7 - Prob. 24PDQCh. 7 - DNA markers have greatly enhanced the mapping of...Ch. 7 - Are sister chromatid exchanges effective in...
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- Of the eight possible phenotypic combinations in the F2 generation, which ones are the product of a single crossover?arrow_forwardIf the likelihood of a single crossover in a particular chromosomalregion is 10%, what is the theoretical likelihood of a double or triplecrossover in that same region? How would positive interferenceaffect these theoretical values?arrow_forwardGenes X, Y, and Z are linked. Crossover gametes between genes X and Y are observed with a frequency of 20%, and crossover gametes between genes Y and Z are observed with a frequency of 10%. What is the expected frequency of double crossover gametes among these genes?arrow_forward
- A three-point testcross is carried out between three linked genes. The resulting nonrecombinant progeny are s+ r+ c+and s r c and the double-crossover progeny are s+ r+ c. Which is the middle locus?arrow_forwardHow can the product rule be used to predict the results of crosses in which multiple genes are studied simultaneously?arrow_forwardIn the 1st image, are all gametes viable since they are parental crossovers? Also, in the 2nd image, are all gametes inviable since they are recombinant crossovers?arrow_forward
- A cross between fruit files with genotypes Aa Bb × aa bb produces the following progeny: 10 Aa Bb 40 Aa bb 40 aa Bb 10 aa bb Were the parental alleles in the coupling or repulsion configuration? Plesse explain!arrow_forwardWith the same setting as the previous problem, in a cross between two BbCc parents, given that an offspring has black coat color and straight fur, what's the probability that it is heterozygous for both genes? Give 2 digits past the decimals.arrow_forwardIn most two-factor crosses involving linked genes, we cannot tellif a double crossover between the two genes has occurred becausethe offspring will inherit the nonrecombinant pattern of alleles.How does the inability to detect double crossovers affect thecalculation of map distance? Is map distance underestimated oroverestimated because of our inability to detect double crossovers?Explain your answer.arrow_forward
- "Gametes produced form the F1 generation offspring having genotype a+ b+ / a b = 40 % a+ b+, 40 % a b, 10 % a+ b, and 10 % a b+." How did you find these percentages?arrow_forwardA plant with the genotype AAbb was crossed with one with the genotype aaBB. The F1 plants were testcrossed. If the genes are not linked, the expected genotypic ratio in the offspring of this testcross would be?arrow_forwardIn most tests of genetic linkage, the number of double crossovers is less than the number expected due to what effect, which limits the number of crossovers that can occur in a short length of chromosome?arrow_forward
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