Campbell Biology, Books a la Carte Plus Mastering Biology with eText -- Access Card Package (10th Edition)
10th Edition
ISBN: 9780133922851
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
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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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?
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?
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?
Chapter 15 Solutions
Campbell Biology, Books a la Carte Plus Mastering Biology with eText -- Access Card Package (10th Edition)
Ch. 15.1 - Which one of Mendel's laws describes the...Ch. 15.1 - MAKE CONNECTIONS Review the description of...Ch. 15.1 - WHAT IF? Propose a possible reason that the first...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 - A wild-type fruit fly (heterozygous for gray body...Ch. 15 - A planet is inhabited by creatures that reproduce...Ch. 15 - Using the information from problem 4, scientists...Ch. 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 - You design Drosophila crosses to provide...Ch. 15 - Banana plants, which are triploid, are seedless...Ch. 15 - EVOLUTION CONNECTION Crossing over is thought to...Ch. 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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- 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 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_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_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_forward
- A 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_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_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
- 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_forwardIn tomatoes, a heterozygous plant with normal fruit and purple stems is crossed with a recessive plant having fasciated fruit and green stems (test cross). The following distribution of offspring is observed: normal fruit, purple stems 38.5% fasciated fruit, green stems 38.5% normal fruit, green stems 11.5% fasciated fruit, purple stems 11.5% What is the recombination frequency?arrow_forward
- In flies, long wings are a dominant trait, and short wings are a recessive trait. Medium wings are the heterozygous trait. Based on this information, if a homozygous long-winged fly is crossed with another a heterozygous fly, their offspring will have which percentages for long, medium, and short wings? Assume random chromosome segregation. A) 25% long, 75% medium, 0% short B) 50% long, 259% medium, 25% short C) 50% long, 50% medium, 0% short D) 100% medium, 0% long, 0% shortarrow_forwardWhat feature(s) of this pedigree indicate(s) dominant inheritance?arrow_forwardIn corn, a colored aleurone is due to the presence of an R allele; r/r is colorless. Another gene controls the color of the plant, with g/g being yellow and G_being green. A plant of unknown genotype is test-crossed, and the following progeny plants were obtained. Colored green 89 Colored yellow 13 Colorless green 9 Colorless yellow 92 What is the recombination frequency between the R locus and the G locus? A. 45.6% B. 9.85% C. 91.15% D. 4.93% E. 6.4%arrow_forward
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