Concepts of Genetics (12th Edition)
12th Edition
ISBN: 9780134604718
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino, Darrell Killian
Publisher: PEARSON
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Chapter 5, Problem 5PDQ
Explain why a 50 percent recovery of single-crossover products is the upper limit, even when crossing over always occurs between two linked genes?
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Why is a 50 percent recovery of single-crossover products theupper limit, even when crossing over always occurs between twolinked genes ?
WHY IS A 50% RECOVERY OF SINGLE-CROSSOVER PRODUCTS THE UPPER LIMIT, EVEN WHEN CROSSINGOVER ALWAYS OCCURS BETWEEN TWO LINKED GENES?
If 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?
Chapter 5 Solutions
Concepts of Genetics (12th Edition)
Ch. 5 - In a family with one autistic child the risk for...Ch. 5 - Given that the prenatal test can provide only a...Ch. 5 - Consider two hypothetical recessive autosomal...Ch. 5 - With two pairs of genes involved (P/p and Z/z), a...Ch. 5 - In Drosophila, a heterozygous female for the...Ch. 5 - HOW DO WE KNOW? In this chapter, we focused on...Ch. 5 - Review the Chapter Concepts list on page 94. Most...Ch. 5 - Describe the cytological observation that suggests...Ch. 5 - Why does more crossing over occur between two...Ch. 5 - Explain why a 50 percent recovery of...
Ch. 5 - Why are double-crossover events expected less...Ch. 5 - What is the proposed basis for positive...Ch. 5 - What two essential criteria must be met in order...Ch. 5 - The genes dumpy (dp), clot (cl), and apterous (ap)...Ch. 5 - Colored aleurone in the kernels of com is due to...Ch. 5 - In the cross shown here, involving two linked...Ch. 5 - In a series of two-point mapping crosses involving...Ch. 5 - Two different female Drosophila were isolated,...Ch. 5 - In Drosophila, a cross was made between femalesall...Ch. 5 - Another cross in Drosophila involved the...Ch. 5 - In Drosophila, Dichaete (D) is a mutation on...Ch. 5 - Drosophila females homozygous for the third...Ch. 5 - In Drosophila, two mutations, Stubble (Sb) and...Ch. 5 - If the cross described in Problem 18 were made,...Ch. 5 - Are mitotic recombinations and sister chromatid...Ch. 5 - What possible conclusions can be drawn from the...Ch. 5 - An organism of the genotype AaBbCc was testcrossed...Ch. 5 - Based on our discussion of the potential...Ch. 5 - Traditional gene mapping has been applied...Ch. 5 - DNA markers have greatly enhanced the mapping of...Ch. 5 - In a certain plant, fruit is either red or yellow,...Ch. 5 - Two plants in a cross were each heterozygous for...Ch. 5 - A number of humanmouse somatic cell hybrid clones...Ch. 5 - A female of genotype produces 100 meiotic tetrads....Ch. 5 - In laboratory class, a genetics student was...Ch. 5 - Drosophila melanogaster has one pair of sex...Ch. 5 - In Drosophila, a female fly is heterozygous for...Ch. 5 - The gene controlling the Xg blood group alleles...Ch. 5 - Prob. 34ESP
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- Of the eight possible phenotypic combinations in the F2 generation, which ones are the product of a single crossover?arrow_forwardExplain why the percentage of recombinant offspring in a testcrossis a more accurate measure of map distance when two genes areclose together. When two genes are far apart, is the percentage ofrecombinant offspring an underestimate or overestimate of theactual map distance?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
- What is the expected number of double crossovers based on the map? What is observed number of double crossover’s based on the data in the table? Calculate the interference using the formula.. Interpret the interference in terms of whether a crossover inhibits or stimulates an additional crossover in the same interval of the chromosome?arrow_forwardConsider the genetic map below. (a) In a total of 1000 observed progeny, how many would be expected to be parental, non-recombinant? (b) If the total number of observed double-crossover recombinant progeny is 0, what is the interference? Show step by step work for full credit. A-------10cm-----B—2.5cm----Carrow_forwardA 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_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_forwardIn the self of a polygenic trihybrid R1/r1 ; R2/r2 ; R3/r3,use the product and sum rules to calculate the proportion of progeny with just one polygene “dose.”arrow_forwardWhy does the presence of double crossovers allow for underestimation of recombinant frequency?arrow_forward
- Consider the genetic map below. (a) In a total of 1000 observed progeny, how many would be expected to be parental, non-recombinant? (b) If the total number of observed double-crossover recombinant progeny is 0, what is the interference? Show step by step A-------10cm-----B—2.5cm----Carrow_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_forwardExplain Recombination frequency underestimates crossover frequencyarrow_forward
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