Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 13, Problem 4TYK
A number of genes carried on the same chromosome are tested and show the following crossover frequencies. What is their sequence in the map of the chromosome?
Genes Crossover Frequencies between Them
C and A 7%
B and D 3%
B and A 4%
C and D 6%
C and B 3%
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Which of the following statements is TRUE?
Positive interference occurs when a crossover in one region of a chromosome interferes with crossovers in nearby regions.
The higher the coefficient of coincidence, the higher the degree of interference.
Linked genes always exhibit recombination frequencies of greater than 50%.
Two genes that are located far from each other on the same chromosome will show a lower frequency of recombination than two genes that are close together on the chromosome.
Recombination mapping experiments become more accurate as the distance between genes increases.
Taking into consideration the following figure, which second crossover would have to occur (number of chromosomes) and between which genes the crossover would have to occur to generate the next arrangement of genotypes in the gametes.
a. 1 and 3 between B and C
b. 3 and 4 between A and B
c. 2 and 3 between A and B
d. 3 and 4 between B and C
e. 1 and 4 between A and B
f. 2 and 4 between B and C
Which 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.
Chapter 13 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 13.1 - You want to determine whether genes a and b are...Ch. 13.2 - You have a true-breeding strain of...Ch. 13.3 - What mechanisms are responsible for: (a)...Ch. 13.4 - A man has Simpson syndrome, an addiction to a...Ch. 13.4 - Prob. 2SBCh. 13.5 - Prob. 1SBCh. 13 - In humans, redgreen color blindness is an X-linked...Ch. 13 - The following pedigree shows the pattern of...Ch. 13 - Individuals affected by a condition known as...Ch. 13 - A number of genes carried on the same chromosome...
Ch. 13 - Prob. 5TYKCh. 13 - Discuss Concepts Can a linkage map be made for a...Ch. 13 - In Drosophila, two genes, one for body color and...Ch. 13 - Another gene in Drosophila determines wing length....Ch. 13 - Prob. 9TYKCh. 13 - You conduct a cross in Drosophila that produces...Ch. 13 - Discuss Concepts Crossing-over does not occur...Ch. 13 - Prob. 12TYKCh. 13 - Prob. 13TYKCh. 13 - Prob. 14TYKCh. 13 - Prob. 1ITDCh. 13 - Prob. 2ITDCh. 13 - Prob. 3ITDCh. 13 - Prob. 4ITD
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- The following recombination frequencies are calculated for four linked genes: Genes Recombination Frequency A and B 2% B and C 17% C and D 4% A and C 15% B and D 13% What is the frequency of crossing-over between A and D? Select one: a. 8% b. 11% c. 6% d. 15%arrow_forwardWhich of the following statement is TRUE? Recombinants cannot be formed without crossovers. Recombinants can only be formed for linked genes Recombinants can only be formed for alleles that follow independent assortment. Recombinants cannot be formed without crossovers between two linked genes. Recombinants of unlinked genes can only be formed by crossovers.arrow_forwardConstruct a chromosome map from the following charts showing crossover frequencies for linkage groups on autosomes. (this one is tricky due to the unusual recombinations Gene Combinations Recombination Frequency y/w 2.2 v/m 3.0 v/r 26.6 v/w 30.0 v/y 32.2 w/m 33.0 y/m 35.2 w/r 56.6arrow_forward
- In 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_forwardCreate a chromosome map for each set of three genes from the given information. b) the crossover frequency between gene X and gene Z is 8.5 %, the crossover frequency between gene Y and gene Z is 2.25 % and between gene Y and gene X is 6.25 %arrow_forwardSubject: Genetics The map distance between locus 1 and locus 2 is 12.6 map units, and the distance between locus 2 and locus 3 is 9.8 map units. The actual frequency of the double cross over from 500 progeny is 2. The value then of the interference is a. 0.806 b. 0.981 c. 0.675 d. 0.903 e. none of the above SHOW THE SOLUTIONarrow_forward
- Two genes, A and B, are 10 map units apart along the same chromosome. A cross was made between AAbb and aaBB individuals to produce AaBb F1 offspring. The F1 offspring were then crossed to aabb individuals to yield an F2 generation. What would be the genotype(s) of F2 offspring that carry recombinant chromosomes? (Note: recombinant chromosomes are the product of crossing over). What percentage of F2 offspring would be Aabb?arrow_forwardGenes Q, R, and S are on the same chromosome. The crossoverfrequency between S and Q is 5%, the crossover frequency betweenQ and R is 30%, and the crossover frequency between R and S is35%. Use this information to create a linkage map for thechromosomearrow_forwardThere are three genes located on the same chromosome: G, H, and I. The recombination frequencies between each pair of genes were determined as follows: Gene Combination Recombination Frequency G/H 15.1% G/I 7.5% H/I 22.6% Which of the following gene maps demonstrate the correct sequence of these genes?arrow_forward
- In certain instances crossing over between two linked genes can be suppressed. For example, this can occur when one chromosome has an inversion. How would crossover suppression affect your results if you were trying to map two genes?arrow_forwardTwo genes are located at opposite ends of a chromosome that is 200 map units long. How are they expected to recombine? a. With a frequency of approximately 50% b. With a frequency of approximately 100% c. With a frequency of approximately 200% d. With unknown frequency because of double crossing-overarrow_forwardDuring a dihybrid cross involving two linked genes (two-point testcross), 20 flies showed recombinant phenotypes, whereas 480 flies showed the parental phenotypes. How far apart are these linked genes from each other? a. 20 cM b. 7.5 cM c. 4 cM d. 0.04 cM e. 8 cMarrow_forward
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