Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 13, Problem 2VCQ
Figure 13.4 Which of the following statements is true?
- Recombination of the body color and red/ cinnabar eye alleles will occur more frequently than recombination of the alleles for wing length and aristae length.
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Which 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.
In rabbits the dominant allele B produces a black coat color and the recessive genotype bb produces a brown coat. Body fat color in rabbits is white if a dominant allele Y is present and yellow if the genotype is yy. Assume the mating between rabbits with the following genotypes :
BBYY x bbyy produces BbYy
Calculate the recombination frequency if the BbYy offspring are mated back to brown rabbits having yellow fat bbyy and the following ratio of phenotypes is observed:
Coat color
Fat color
# Observed
Black
White
125
Black
Yellow
75
Brown
White
85
Brown
Yellow
115
Three linked loci are evaluated to determine the recombination frequency of the loci. To set up the test cross, an individual that is true breeding dominant for all three phenotypes is crossed with an individual that is true breeding recessive for all three phenotypes. F1 offspring are crossed with individuals that are recessive for all phenotypes. The phenotypic results are shown in the table below.
Phenotype
Number of Offspring
Dominant 1, Dominant 2, Dominant 3
322
Dominant 1, Dominant 2, Recessive 3
82
Recessive 1, Dominant 2, Recessive 3
5
Dominant 1, Recessive 2, Dominant 3
2
Recessive 1, Dominant 2, Dominant 3
28
Recessive 1, Recessive 2, Dominant 3
89
Recessive 1, Recessive 2, Recessive 3
312
Dominant 1, Recessive 2, Recessive 3
25
1. Which two phenotypes are parental?
2. What is the map distance between locus 1 and locus 2?
3. What is the map distance between locus 1 and locus 3?
4. What is the map distance between…
Chapter 13 Solutions
Biology 2e
Ch. 13 - Figure 13.3 In a test cross for two...Ch. 13 - Figure 13.4 Which of the following statements is...Ch. 13 - Figure 13.6 Which of the following statements...Ch. 13 - X-linked recessive traits in humans (or in...Ch. 13 - The first suggestion that chromosomes may...Ch. 13 - Which recombination frequency corresponds to...Ch. 13 - Which recombination frequency corresponds to...Ch. 13 - Which of the following codes describes position 12...Ch. 13 - In agriculture, polyploid crops (like coffee,...Ch. 13 - Assume a pericentric inversion occurred in one of...
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- Two 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_forwardWhich of the following statements are true regarding the F2 offspring of a mapping cross for three genes on the same chromosome? Recombinant allelic combinations will occur less frequently when genes are further apart. assuming all three genes are genetically linked, the most common classes of F2 offspring will be those containing parental allelic combinations the recombination rate calculated between any pair of genes will never exceed 50% F2 offspring will tend to inherit all dominant or all recessive alleles from the triheterozygous parent the alleles bf each gene willassort independently making parental and recombinant allelic combinations equally likely among the F2. double recombinant offspring will be the rarest classarrow_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
- 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?arrow_forwardWhich of the following are true statements regarding linkage disequilibrium? Please select all that apply. Low recombination rate favors linkage disequilibrium. Alleles at two loci are found together more frequently than could be explained by chance. Alleles don't have to be physically linked in order to be in linkage disequilibrium. DAsexual reproduction is very effective at preventing linkage disequilibrium.arrow_forwardUse the data provided in the figure to calculate the recombination frequency between the two genes. Parents Wild Type (gray with normal wings) bb vg* vg Black with vestigial wings bb vg vg recombination frequency: % + TOOLS x10 Wild Type Black nogmal Black vestigial Gray vestigial b'bvg vg bb vg vg bb vg vg bb vg vg The number of each type of offspring is • wild type: 865 • black vestigial: 875 • gray vestigial: 160 • black normal: 100arrow_forward
- 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.arrow_forwardWhich of the following statements are true regarding linkage? Select ALL that apply. When the map distance between two genes is less an 100 map units they are genetically linked When the map distance between two genes is less than 50 map units they are genetically linked genes on the same chromosome are always genetically linked. When two genes occur on the same chromosome they are physically linked When the map distance between two genes in less than 50 cM they are genetically linked.arrow_forwardWild-type mice have brown fur and short tails. Loss of function of a particular gene produces white fur, while loss of function of another gene produces long tails, and loss of function at a third locus produces agitated behavior. Each of these loss of function alleles is recessive. If a wild-type mouse is crossed with a triple mutant, and their F1 progeny is test-crossed, the following recombination frequencies are observed among their progeny. Produce a genetic map for these loci. Brown, short tailed, normal: 955 White, short tailed, normal: 16 Brown, short tailed, agitated: 0 White, short tailed, agitated: 36 Brown, long tailed, normal: White, long tailed, normal: Brown, long tailed, agitated: 46 0 14 White, long tailed, agitated: 933arrow_forward
- Consider the following statements about linkage: 1. One map unit of distance is equivalent to a 10% recombination frequency. 2. If a two-factor testcross produces very few recombinants, the two genes are far apart. Determine which option below is correct. Statements 1 and 2 are both false. Statements 1 and 2 are both true. Statement 1 is false, Statement 2 is true. Statement 1 is true, Statement 2 is false.arrow_forwardCougar coat color and eye color are determined by two genes on the same chromosome, gene C and gene E. Gene C has two alleles: the dominant allele C produces wild type (tan) coats and the recessive allele c produces white coats. Gene E has two alleles: the dominant allele E produces wild type (brown eyes) and the recessive allele e confers blue eyes. To determine the recombination rate between these two loci you cross a wild-type cougar (CCEE) to a white-coated, blue-eyed cougar to produce a diheterozygous male cougar (CcEe). You then mate F1 male to a series of white-coated, blue-eyed female cougars to produce a panel of F2 offspring in the table below. What is the recombination rate between the two loci? Express your answer in map units, rounded to the nearest integer. phenotype number of F1 offspring tan coat, brown eyes 200 tan coat, blue eyes 50 white coat, blue eyes 201 white coat, brown eyes 55arrow_forwardWhich of the following statement is TRUE? Recombinants cannot be formed without crossovers between two linked genes. O Recombinants cannot be formed without crossovers. O Recombinants can only be formed for alleles that follow independent assortment. Recombinants can only be formed for linked genes Recombinants of unlinked genes can only be formed by crossovers.arrow_forward
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