Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 15, Problem 15.3CR
Why are specific alleles of two distant genes more likely to show recombination than those of two closer genes?
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In a series of mapping experiments, the recombination frequencies for four different linked genes were determined as follows:
vg= vestigial wings vg-b = 19
cn= cinnabar eyes vg-cn = 9
rb= reduced bristles vg-rb = 16
b= black body rb-b = 3.5
rb-cn = 6.5
cn-b = 9
Please map the genes in order on a chromosome. Which two genes are the closest together? What is your evidence?
Individuals 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 locilinked? 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?
Which individual in Figure 18-3 has the most heterozygous loci, and which individual has the fewest?
Chapter 15 Solutions
Campbell Biology
Ch. 15.1 - MAKE CONNECTIONS Review the description of...Ch. 15.1 - WHAT IF? Propose a possible reason that the first...Ch. 15.1 - Which one of Mendel's laws describes the...Ch. 15.2 - A white-eyed female Drosophila is mated with a...Ch. 15.2 - Neither Tim nor Rhoda has Duchenne muscular...Ch. 15.2 - MAKE CONNECTIONS Consider what you learned about...Ch. 15.3 - When two genes are located on the same chromosome,...Ch. 15.3 - VISUAL SKILLS For each type of offspring of the...Ch. 15.3 - Prob. 3CCCh. 15.4 - Prob. 1CC
Ch. 15.4 - Prob. 2CCCh. 15.4 - Prob. 3CCCh. 15.5 - Gene dosagethe number of copies of a gene that are...Ch. 15.5 - Reciprocal crosses between two primrose varieties,...Ch. 15.5 - WHAT IF? Mitochondrial genes are critical to the...Ch. 15 - What characteristic of the sex chromosomes allowed...Ch. 15 - Why are males affected by X-Iinked disorders much...Ch. 15 - Why are specific alleles of two distant genes more...Ch. 15 - Prob. 15.4CRCh. 15 - Explain how genomic imprinting and inheritance of...Ch. 15 - A man with hemophilia (a recessive, sex-linked...Ch. 15 - Pseudohypertrophic muscular dystrophy is an...Ch. 15 - Prob. 3TYUCh. 15 - A planet is inhabited by creatures that reproduce...Ch. 15 - Prob. 5TYUCh. 15 - A wild-type fruit fly (heterozygous for gray body...Ch. 15 - Assume that genes, A and B are on the same...Ch. 15 - Two genes of a flower, one Controlling blue (B)...Ch. 15 - Prob. 9TYUCh. 15 - Banana plants, which are triploid, are seedless...Ch. 15 - Prob. 11TYUCh. 15 - SCIENTIFIC INQUIRY DRAW IT Assume you are mapping...Ch. 15 - WRITE ABOUT A THEME: INFORMATION The continuity of...Ch. 15 - SYNTHESIZE YOUR KNOWLEDGE Butter flies have an X-Y...
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- A wild-type fruit fly (heterozygous for gray body color and wings) is mated with a black fruit fly with no wings. The offspring are: gray body with wings: 895 black body with wings: 905 gray body without wings: 110 black body without wings: 90 What is the recombination frequency between the two genes?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_forwardA cross is made between AaBbCc and aabbcc plants, and the offspring occur in the following numbers: 30 aaBbCc 15 aaBbcc 30 aabbCc 15 aabbcc 15 AaBbCc 30 AaBbcc 15 AabbCc 30 Aabbcc What is the arrangement of alleles on the homologous chromosomes of the heterozygous parent? Include map units.arrow_forward
- Why is it more efficient to perform a test cross with a homozygous recessive donor than a homozygous dominant donor? How could the same information still be found with a homozygous dominant donor?arrow_forwardGenes M and N are 8.0 map units apart on one chromosome. Genes R and S are 7.5 map units apart on a second non-homologous chromosome. What is recombination frequency between M and R?arrow_forwardIn the mapping example in Fig 2, the dominant alleles were on one chromosome and the recessive alleles were on the homolog. Let’s consider a twofactor cross in which the dominant allele for one gene is on onechromosome, but the dominant allele for a second gene is on thehomolog. A cross is made between AAbb and aaBB parents. The F1offspring are AaBb. The F1 heterozygotes are then testcrossed to aabbindividuals. What topic in genetics does this question address?arrow_forward
- If a recombination frequency cannot be above 50%, what does it mean if two genes are, say, 60 mu apart? Does that mean they technically independently assort, there is just some sort of overestimation? Or that the two genes actually have another gene in between?arrow_forwardIn the mapping example in Fig 2, the dominant alleles were on one chromosome and the recessive alleles were on the homolog. Let’s consider a twofactor cross in which the dominant allele for one gene is on onechromosome, but the dominant allele for a second gene is on thehomolog. A cross is made between AAbb and aaBB parents. The F1offspring are AaBb. The F1 heterozygotes are then testcrossed to aabbindividuals. Which F2 offspring are recombinant?arrow_forwardWhich of the following statements about crossover is FALSE? Frequent crossover between linked genes that are far apart on the chromosome may lead to 50% recombinant frequency. Crossover between homologous chromosomes would lead to a reshuffling of alleles. Crossover between sister chromatids would lead to a reshuffling of alleles. Crossover occurs at higher frequency between linked genes that are further apart than those that are close to each other. Crossover between non-sister chromatids would lead to a reshuffling of alleles.arrow_forward
- Consider a situation where F1 is backcrossed with one of its parental lineage and we obtained A1H1/A2H2 : A2H1/A2H2 : A2H2/A2/H2: A1H2/A2H2 = 295 : 186 : 310 : 209, where A1 and A2 are alleles at a locus and H1 and H2 are alleles at the other locus. What is the recombination (genetic) distance between the two loci in centimorgans? A. 8.9 B. 22.5 C. 18.4 D. 50 E. 39.5arrow_forwardTwo linked loci have a recombination frequency of 5%. A series of crosses is performed. The P generation includes an individual that is homozygous dominant for trait 1 and homozygous recessive for trait 2. The second individual is homozygous recessive for trait 1 and homozygous dominant for trait 2. The F1 generation is crossed with individuals that are homozygous recessive for both traits. If 400 F2 offspring are produced, how many offspring with each phenotype are expected? Fill in the table below with your answers. Phenotype Number of Offspring Predicted Recessive 1, Recessive 2 Dominant 1, Dominant 2 Recessive 1, Dominant 2 Dominant 1, Recessive 2 Total offspring 400 For the results above, determine which phenotypes are parental and which are recombinant. Phenotype Parental or Recombinant? Dominant 1, Dominant 2 Recessive 1, Dominant 2 Recessive 1, Recessive 2 Dominant 1, Recessive 2arrow_forwardJ, K, L, M, and N are five genes found on a single chromosome in rabbits. The recombination frequencies between the five genes, as determined by multiple experimental crosses, are shown below. L-J = 31% L-M = 40% M-J = 9% N-K = 8% N-J = 19% K-M = 20% Knowing that Gene L is at position 1 on the rabbit chromosome shown below, place the remaining genes in their appropriate positions. L 1 5 K 10 J 115 20 M 25 30 N 35 40arrow_forward
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