Genetic Analysis: An Integrated Approach (2nd Edition)
Genetic Analysis: An Integrated Approach (2nd Edition)
2nd Edition
ISBN: 9780321948908
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter 13, Problem 26P

In the tomato, Solanumesculentum, tall ( D- ) is dominant to dwarf (dd) plant height, smooth fruit ( P- ) is dominant to peach fruit (pp), and round fruit shape ( O- ) is dominant to oblate fruit shape (oo). These three genes are linked on chromosome 1 of tomato in the order dwarf–peach–oblate . There are   12 map units between dwarf and peach and   17 map units between peach and oblate. A trihybrid plant ( DPO/dpo ) is test-crossed to a plant that is homozygous recessive at the three loci ( dpo/dpo ). The accompanying table shows the progeny plants. Identify the mechanism responsible forthe resulting data that do not agree with the established genetic map.

Progeny Phenotype Number
Tall, smooth, round 473
Dwarf, peach, oblate 476
Tall, smooth, oblate 12
Dwarf, peach, round 8
Tall, peach, oblate 17
Dwarf, smooth, round 13
Tall, peach, round 0
Dwarf, smooth, oblate 1
1000
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In tomato plants, the genes for fruit colour (C), fruit fructose content (F), fruit length (L), and plant height (H) are all found on chromosome 4. Map distances between the four genes are shown below.    Genes Distance in Map Units H and F  40 F and L  12 C and F 75 L and C  87 L and H  52   Sketch and label a gene map to identify the order of the four genes on chromosome 1 in tomato plants.
In tomato, the following genes are located on chromosome 2: +   tall plant                            d     dwarf plant +   uniformly green leaves     m    mottled green leaves       +   smooth fruit                       p     pubescent (hairy) fruit        Results of the cross +++ / dmp and dmp / dmp were: + + + = 470                                 + m p = 1 + + p = 14                                   d + p = 25 d + + = 0                                     d m p = 441 + m + = 19                                  d m + = 30   Identify the single and double crossovers among the progeny.
The following corn loci are on one arm of chromosome9 in the order indicated (the distances between themare shown in map units):c-bz-wx-sh-d-centromere12 8 10 20 10C gives colored aleurone; c, white aleurone.Bz gives green leaves; bz, bronze leaves.Wx gives starchy seeds; wx, waxy seeds.Sh gives smooth seeds; sh, shrunken seeds.D gives tall plants; d, dwarf.A plant from a standard stock that is homozygous for allfive recessive alleles is crossed with a wild-type plantfrom Mexico that is homozygous for all five dominantalleles. The F1 plants express all the dominant allelesand, when backcrossed to the recessive parent, give thefollowing progeny phenotypes:colored, green, starchy, smooth, tall 360white, bronze, waxy, shrunk, dwarf 355colored, bronze, waxy, shrunk, dwarf 40white, green, starchy, smooth, tall 46colored, green, starchy, smooth, dwarf 85white, bronze, waxy, shrunk, tall 84colored, bronze, waxy, shrunk, tall 8white, green, starchy, smooth, dwarf 9colored, green, waxy, smooth,…

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Genetic Analysis: An Integrated Approach (2nd Edition)

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