Campbell Biology: Custom Edition
18th Edition
ISBN: 9781323717271
Author: Urry, Cain, Wasserman, Minorsky, Reece
Publisher: PEARSON C
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Chapter 15.3, Problem 3CC
Summary Introduction
To determine: The order of the genes A, B, and C on the chromosome.
Concept introduction:
Recombination frequency is the number of times a particular chromosome is crossed over between two genes. Distance between the two genes can be estimated by the recombination frequency as the recombination frequency is the measure for mapping the position of genes.
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Mitotic recombination can occasionally produce a twin spot.Let’s suppose an animal species is heterozygous for two genesthat govern fur color and length: one gene affects pigmentation,with dark pigmentation (A) dominant to albino (a); the other geneaffects hair length, with long hair (L) dominant to short hair (l).The two genes are linked on the same chromosome. Let’s assume ananimal of this species is AaLl; A is linked to l, and a is linked to L.Draw the chromosomes labeled with these alleles, and explainhow mitotic recombination could produce a twin spot with onespot having albino pigmentation and long fur and the other havingdark pigmentation and short fur.
can you please quickly explain?
Do not use Ai and chatgpt
Chapter 15 Solutions
Campbell Biology: Custom 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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- 7arrow_forwardTrihybrid Cross: Several testcrosses have revealed the rate of recombination for the following genes which are KNOWN TO BE LINKED: k-m 0.30 k-l 0.76 l-m 0.50 What is the order of the three genes and why is the frequency of recombination between the closest pair of genes not equal to the recombination rate between the two genes farthest apart? (0.8 > 0.76)arrow_forwardWhat 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_forward
- the loci p and bz are normally 36 m.u. apart on a chrmomosome. A paracentric inversion spans one fourth of this region but does not include either of the loci. What approximate recombination frequency between the loci would you predict for a heterozygous plant? A homozygous plant?arrow_forwardCrossover frequencies for some genes on a tomato plant: • Normal leaves (M) and tall plant (D) 12% • Normal leaves (M) and normal tomato (O) 33% • Normal leaves (M) and simple florescence (S) 64% • Tall plant (D) and normal tomato (0) 21% • Tall plant (D) and simple fluorescence (S) 52% Draw a chromosome map and state the cross-over frequency between genes for a normal tomato and simple florescence.arrow_forwardgps3arrow_forward
- . Chromosome 3 of corn carries three loci (b for plant-color booster, v for virescent, and lg for liguleless). A testcross of triple recessives with F1 plants heterozygous forthe three genes yields progeny having the followinggenotypes: 305 + v lg, 275 b + +, 128 b + lg, 112 + v +,74 + + lg, 66 b v +, 22 + + +, and 18 b v lg. Give the genesequence on the chromosome, the map distances between genes, and the coefficient of coincidence.arrow_forwardItem 10 10 of 15 > A cross in Drosophila melanogaster involved the recessive X-linked genes for white eye (w), yellow body (y), and cut wings (c). A wild-type tri-hybrid female was crossed with wild-type males and only the male offspring were tallied. On the basis of the results shown below, which of the choices shown best represents the genetic map of the three loci on the X-chromosome? Phenotype Male Offspring +у ct 63 W + + 60 w y ct 16 + + + 11 + + ct 4 w y + + у + 247 w + ct 197 5.5 mu 21.5 mu >< ct 5.5 mu 21.5 mu y ct 21.5 mu 5.5 mu ct 4.5 mu 20.5 mu y ct 20.5 mu 4.5 mu ct Submit Request Answerarrow_forwardIn Drosophila (fruit flies), jammed wings (J), daughterless (da), curly wings (Cy), star eyes (S), and a black body (b) are determined by genes located on the same chromosome. Gene Combination Recombination Frequency J and Cy 34.9 J and da 1.7 S and Cy 4.8 Cy and b 42.4 S and da 38 b and S 47.2 What is the map unit distance between b and da?Answer map unitsRecord your answer as a value rounded to one decimal place.arrow_forward
- Linkage Mapping Using Dihybrid Testcrosses in Fruit Flies In fruit flies, the normal honey-gray body-color (bl*) is dominant to black (bl), having normal red eyes (pu+) is dominant to purple (pu), and having normal wings (vg+) is dominant to vestigial (vg). The three genes are located close together on the same chromosome. Your task is to use data from three dihybrid testcrosses to (1) calculate recombination frequencies, (2) convert recombination frequencies into map distances, and (3) build a map of the chromosome interval covered by the three genes, indicating their order and distances between them. BLACK PURPLE DIHYBRID CROSS In the parental generation, you mate a pure-breeding wild-type female (bl+/blt;put/pu+) with a pure-breeding black, purple male (bl/bl;pu/pu) to produce an F1 generation that is all wild-type (bl+/bl;pu*/pu). Note that the F1 flies are all dihybrid. Next, you mate several F1 dihybrid females (bl+/bl;pu*/pu) with tester males, which are black, purple…arrow_forwardCan you show the cross? Any explanation would be goodarrow_forwardgenetics, pleaseeee solve parts a, b and carrow_forward
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