CAMPBEL BIOLOGY:CONCEPTS & CONNECTIONS
10th Edition
ISBN: 9780136538820
Author: Taylor
Publisher: INTER PEAR
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Chapter 9, Problem 10TYK
A series of matings shows that the recombination frequency between the black-body gene (problem 9) and the gene for dumpy (shortened) wings is 36%. The recombination frequency between purple eyes and dumpy wings is 41%. What is the sequence of these three genes on the chromosome?
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Assume you are mapping genes A, B, C, and D in Drosophila. You know that these genes are linked on the same chromosome, and you determine the recombination frequencies between each pair of genes to be as follows: A–B, 8%; A– C, 28%; A–D, 25%; B–C, 20%; B–D, 33%. (a) Describe how you determined the recombination frequency for each pair of genes. (b) Draw a chromosome map based on your data.
In an electrophoretic gel across which is applied a powerful electrical alternating pulsed field, the DNA of the haploid fungus Neurospora crassa (n = 7) moves slowly but eventually forms seven bands, which represent DNA fractions that are of different sizes and hence have moved at different speeds. These bands are presumed to be the seven chromosomes. How would you show which band corresponds to which chromosome?
L, R, P and D are four genes located on the same chromosome in a diploid
organism. Map distances between different pairs of genes were determined and
the following results obtained. Based on these data, what is the order of the
genes on the chromosome?
D-R: 35 CM
P-D: 5 CM
L-R: 10 CM
D-P: 30 CM
D-L 25 CM
P-R: 40 CM
Note that only one orientation of the order is given as an answer choice. For
example: ABCD has the same order as DCBA, but only ABCD would be listed
as a possible answer. So be sure to check both orientations when comparing
your gene order to the possible answer choices.
D-L-P-R
P-D-L-R
P-R-D-L
L-P-R-D
R-L-D-P
Chapter 9 Solutions
CAMPBEL BIOLOGY:CONCEPTS & CONNECTIONS
Ch. 9 - Connecting the Concepts 1. Complete this concept...Ch. 9 - Whether an allele is dominant or recessive depends...Ch. 9 - Edward was found to be heterozygous (Ss) for...Ch. 9 - Two fruit flies with eyes of the usual red color...Ch. 9 - A man with type B blood and a woman who has type A...Ch. 9 - Tim and Jan both have freckles (see Module 9.9),...Ch. 9 - Both Tim and Jan (problem 6) have a widows peak...Ch. 9 - In rabbits, black hair depends on a dominant...Ch. 9 - A fruit fly with a gray body and red eyes...Ch. 9 - A series of matings shows that the recombination...
Ch. 9 - A couple are both phenotypically normal, but their...Ch. 9 - Why do more men than women have colorblindness?Ch. 9 - In fruit flies, the genes for wing shape and body...Ch. 9 - Adult height in humans is at least partially...Ch. 9 - Heather was surprised to discover she suffered...Ch. 9 - In 1981, a stray black cat with unusual rounded,...Ch. 9 - SCIENTIFIC THINKING The breakthrough that led...
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- In a series of mapping experiments, the recombination frequencies for four different linked genes of the Drosophila fly were determined, as shown in the figure. Based on this information, what is the most probable order of these genes on the chromosome? b 0 cn 90 rb 3.5 6.5 0 vg 19 9.0 16 0 b cn rb vg The numbers in the boxes are the recombination frequencies in between the genes (in percent). O b-rb-cn-vg O vg-cn-b-rb Orb-cn-vg-b b = black body cn = cinnabar eyes rb = reduced bristles vg = vestigial wings O vg-b-rb-cnarrow_forwardConsider two loci A and B that are 30 cM apart on chromosome 1 in the fruit fly. A paracentric inversion is found to span about half of the distance between these loci, but not include either A or B. What is the approximate recombination frequency expected for these loci in … flies that are heterozygous for this inversion? RF(A-B) for heterozygous flies is … flies that are homozygous for this inversion? RF(A-B) for homozygous flies is …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_forward
- In 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_forwardIn D. melanogaster, reduced bristles (rd), cinnabar eyes (cn), and vestigial wings (vg) are recessive traits located on chromosome II in that order. The distance between rd and cn is 7 cM and the distance between cn and vg is 9 cM. The CoC for this chromosome is 0.9. A true-breeding female expressing cinnabar eyes and vestigial wings is crossed to a true-breeding male expressing reduced bristles. The F1 are wild type. An F1 female is then test crossed to a male expressing all three traits. Among the F2 progeny, how often would you expect to observe flies expressing only cinnabar eyes? Using the same information from above, among the F2 progeny, how often would you expect to observe completely wild-type flies?arrow_forwardIn D. melanogaster, reduced bristles (rd), cinnabar eyes (cn), and vestigial wings (vg) are recessive traits located on chromosome II in that order. The distance between rd and cn is 7 cM and the distance between cn and vg is 9 cM. The CoC for this chromosome is 0.9. A true-breeding female expressing cinnabar eyes and vestigial wings is crossed to a true-breeding male expressing reduced bristles. The F1 are wild type. An F1 female is then test crossed to a male expressing all three traits. Among the F2 progeny, how often would you expect to observe flies expressing only cinnabar eyes? Using the same information from above, among the F2 progeny, how often would you expect to observe flies expressing only vestigial wings?arrow_forward
- The following recombinant frequencies were found between genes A, B, C, D, and E. Determine the order of these genes on the chromosome and draw a linkage map of this chromosome with the map units labeled. А, С: 10% А, D: 30% А, Е: 6% В, С: 4% В, D: 16% В, Е: 20% C, D: 20%arrow_forwardA PORTION OF THE LINKAGE MAP OF CHROMOSOME 2 IN THE TOMATO IS ILLUSTRATED HERE. ci (compound influorescence) o (oblate) - 15 CM 20 CM p (peach) THE OBLATE PHENOTYPE IS A FLATTENED FRUIT, THE PEACH PHENOTYPE IS HAIRY FRUIT (LIKE A PEACH), AND COMPOUND INFLORESCENCE MEANS CLUSTERED FLOWERS. IGNORE THE PEACH LOCUS. AMONG 1000 GAMETES PRODUCED BY A PLANT OF GENOTYPE O CI /+ +, WHAT TYPES OF GAMETES WOULD BE EXPECTED, AND WHAT NUMBER WOULD BE EXPECTED OF EACH?arrow_forwardThe order of the genes on a plant chromosome is A, B, C, where A and B are located 10 cM apart and B and C are located 3 cM apart. What is the probability that the trihybrid ABC/abc will produce any kind of recombinant gamete?arrow_forward
- If 2 genes on the same chromosome have a recombination frequency of .01, what is the genetic distance from each other in map units?arrow_forwardIn the figure below, black and pink lines are used to represent nonhomologous chromosomes. Which of the figures matches the following descriptions? More than one diagram may correspond to any one statement, and a diagram may be a correct answer for more than one question. 1) Gametes produced by a reciprocal translocation heterozygote: 2) Genetically balanced gametes produced by a reciprocal translocation heterozygote:arrow_forwardBelow are the results from a 3 gene testcross between an XxYyZz plant and an xxyyzz plant: Testcross outcome: XYZ 365 xyz 367 xYz 110 XyZ 105 XYZ 3 Xyz 4 XYZ 25 xyZ 21 1. Determine the order of these genes on the chromosome. Indicate them on the diagram below. 2. Calculate the map distances between the genes (give you answer as map units). Indicate these distances on the diagram above. 3. Determine the coefficient of coincidence. 4. Determine the interference among these genes.arrow_forward
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