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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Textbook Question
Chapter 5, Problem 8PDQ
What two essential criteria must be met in order to execute a successful mapping cross?
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What two essential criteria must be met in order to execute a successful mapping cross?
What ratio of genotypes to phenotypes is observed in a two-point test cross if genes are unlinked?
in three points mapping one parent has the A+C/+b+ genotype that was crossed to a homozygous recessive second parent.
a)what is the genotype of this second parent?
b)what are the genotypes of the double cross over offspring?
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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- What will be the PR and GR of the following crosses? Give also their phenotypes. (Designate your own phenotype for each character) AaBb x aabb AAbb x AaBB AaBb x aaBB AABb x aabbarrow_forwardUsing the forked-line, or branch diagram, method, determine the genotypic and phenotypic ratios of these trihybrid crosses: (a) AaBbCc * AaBBCC, (b) AaBBCc * aaBBCc, and (c) AaBbCc * AaBbCc.arrow_forwardWhat are the expected phenotypic ratios from the following cross:Tt Rr yy Aa × Tt rr YY Aa, where T = tall, t = dwarf, R = round,r = wrinkled, Y = yellow, y = green, A = axial, a = terminal; T, R,Y, and A are dominant alleles. Note: Consider using the multiplication method in answering this problemarrow_forward
- (a) DdGGww x DDGgWw ow being (b) ddggWw x DdGgww (c) DdGgWw x DdggWw (d) DdGgWW x DdGgWW de 10. What phenotypes are expected and in what proportion from each of the following crosses? (Assume D, G and Ware dominant over d, g and w, respectively.) mo to esc Ils ovit 101 SUO hamnow brid Jesus 1860 88 HOW bildicion baild am lemon a Bal 101 mem nem lemonarrow_forwardA) In these plants, green leaf color is dominant to yellow leaf color. You are given a plant with green leaves and are asked to determine its genotype. What type of cross will you perform? B) The results of this cross are: 50% green leaf plants and 50% yellow leaf plants. What is the genotype of the green leaf plant you were given?arrow_forwardIn which kind of cross would you expect to find a ratio of 9:3:3:1 among the F2 spring A) Monohybrid crossB) None of these choices is correctC) testcrossD) Dihybrid crossarrow_forward
- How many different kinds of F1 gametes, F2 genotypes, and F2 phenotypes would be expected from the following crosses: (a) AA x aa; (b) AA BB x aa bb; (c) AA BB CC x aa bb cc? (d) What general formulas are suggested by these answers?arrow_forwardThe expected ratio of phenotypes among the progeny of a test cross is 1:1:1:1. Out of 200 total resulting progeny, 48 occur in one of the four phenotypic classes. Given this information, which of the following must also be true? a)At least one additional cell must also contain a count of 48. b)The progeny of this cross do not conform to a 1:1:1:1ratio. c)The value of observed - expected for this cell = -2. d)Since 48 is so close to the expected value, there is no need to calculate chi square before drawing a conclusion about the ratio.arrow_forwardThe genotypes of F1 individuals in a trihybrid cross are LlMMNn x llMmNn. What is the probability that the F2 offspring will have an LlMmnn genotype? Use the forked-line method in solving the problem.arrow_forward
- Assume performing only one cross, which produced 274 flies, which consisted of 193 wild-type flies and 81 white-eyed flies. (a) Based upon this information, what is the most likely genotype of the female parent? (b) How to confirm the above answer with only the result from this one cross?arrow_forwardIf the F2 of a dihybrid cross gives a 9:3:4 ratio, what will be the ratio of phenotypes if one takes an F1 individual (from the same cross) and test crosses it (keeping the same order of phenotypes)?arrow_forwardIndividuals of genotype AaBb were mated to individuals of genotype aabb. One thousand offspring were counted, with the following results: 474 Aabb, 480 aaBb, 20 AaBb, and 26 aabb. What type of cross is it? Are these loci linked? What are the two parental classes and the two recombinant classes of offspring? What is the percentage of recombination between these two loci? How many map units apart are they?arrow_forward
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