Concepts of Genetics (11th Edition)
11th Edition
ISBN: 9780321948915
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Publisher: PEARSON
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Chapter 5, Problem 27PDQ
Two plants in a cross were each heterozygous for two gene pairs (Ab/aB) whose loci are linked and 25 mu apart. Assuming that crossing over occurs during the formation of both male and female gametes and that the A and B alleles are dominant, determine the
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Two plants in a cross were each heterozygous for two gene pairs (Ab/aB) whose loci are linked and 25 mu apart. Assuming that crossing over occurs during the formation of both male and female gametes and that the A and B alleles are dominant, determine the phenotypic ratio of their offspring.
In a cross between two, dihybrid, heterozygous individuals, what fraction of the offspring will be dominant for only the (A) gene?
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Chapter 5 Solutions
Concepts of Genetics (11th 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 - Prob. 3CSCh. 5 - Prob. 4CSCh. 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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- Following a cross between two, dihybrid, heterozygous individuals, what fraction of the offspring are predicted to have a genotype that is heterozygous for both genes?arrow_forwardIn a cross between a homozygous red-eyed female fruit fly and a white-eyed male fruit fly, what is the expected outcomearrow_forwardConsider an individual with the AB/ab genotype, and assume that alleles of the A and B genes areunable to recombine during meiosis. If this individual is crossed with an individual who is homozygousrecessive at both genes (ab/ab), what is the expected phenotype ratio in the offspring?arrow_forward
- . The pedigree below was obtained for a rare kidney disease.a. Deduce the inheritance of this condition, stating your reasons. b. If persons 1 and 2 marry, what is the probability that their first child will have the kidney disease?arrow_forwardTwo pea plants heterozygous for pod color and pod shape characters are crossed. Draw the punnet square to determine the genotypic and phenotypic ratios of the offspring.arrow_forwardIn a cross between fair skin, black hair (heterozygous for all these traits) with brown skin, red hair, what is the phenotypic ratio of the offspring?arrow_forward
- assuming independent assortment, what phenotypic ratio would you expect to see if an individual with the genotype RrGg is self-crossedarrow_forwardassuming independent assortment, what phenotypic ratio would you see if an individual with the genotype RrGg is self-crossedarrow_forwardYou crossed two true-breeding lines of violet-flowered and white-flowered peas. Is it possible to establish a true-breeding line of the genotype found in the offspring of your cross? Why or why not?arrow_forward
- . Assume that white color (W) is dominant over yellow color (w) in corn. Perform a Punnett square for a cross where pollen from the anthers of a plant that is heterozygous for color is placed on the pistil of a yellow-fruited plant. What are the genotypes and phenotypes you would expect to find from this cross?arrow_forwardGiven a cross between AabbCcDdEeFFGgHh x AaBbCcDdEEffggHH, a) how many possible gametes can the first individual produce? b) what proportion of the offspring will phenotypically resemble the first parent? c) what proportion of the offspring will genotypically resemble the second parent? d) how many phenotypes can be expected from the cross?arrow_forwardTall (D) is dominant over short (d). if a true-breeding tall plant is crossed with a true-breeding short plant, the f2 generation will have a tall:short phenotypic ratio of ___.arrow_forward
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