34 a,b Note that the starting heterozygous plant does not have its parents genotypes listed. However, we can determine that the starting heterozygous plant has S,U,tu alleles on one chromosome and s,u,Tu alleles on the other because they are most common combinations in the offspring. 34. Fine spines (s), smooth fruit (tu), and uniform fruit color (u) are three recessivetraits in cucumbers, the genes for which are linked on the same chromosome.A cucumber plant heterozygous for all three traits is used in a testcross, and thefollowing progeny are produced by this testcross:UTu2STu70Tu21Stu4Utu82Stu21SUTu13tu17Total230a. Determine the order of these genes on the chromosome.b. Calculate the map distances between the genes.c. Determine the coefficient of coincidence and the interference among thesegenes.d. List the genes found on each chromosome in the parents used in thetestcross.

Name: 34 a,b Note that the starting heterozygous plant does not have its par
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Description: 34 a,b Note that the starting heterozygous plant does not have its parents genotypes listed. However, we can determine that the starting heterozygous plant has S,U,tu alleles on one chromosome and s,u,Tu alleles on the other because they are most com

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Human Anatomy & Physiology (11th Edition)

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Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

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34 a,b Note that the starting heterozygous plant does not have its parents genotypes listed. However, we can determine that the starting heterozygous plant has S,U,tu alleles on one chromosome and s,u,Tu alleles on the other because they are most common combinations in the offspring.

34. Fine spines (s), smooth fruit (tu), and uniform fruit color (u) are three recessive
traits in cucumbers, the genes for which are linked on the same chromosome.
A cucumber plant heterozygous for all three traits is used in a testcross, and the
following progeny are produced by this testcross:
U
Tu
2
S
Tu
70
Tu
21
S
tu
4
U
tu
82
S
tu
21
S
U
Tu
13
tu
17
Total
230
a. Determine the order of these genes on the chromosome.
b. Calculate the map distances between the genes.
c. Determine the coefficient of coincidence and the interference among these
genes.
d. List the genes found on each chromosome in the parents used in the
testcross.

Expert Solution

Step 1

Order of genes

The gene orders are defined as the permutation of the arrangement of genome.

The offspring are first arranged into reciprocal pairs of no crossovers, single cross over( SCO) and double cross over (DCO).
As there is higher probability of having no crossover, the two genotypes having highest number of offspring are NCO.
There will be two sets of SCO and two will DCO with lowest offspring.

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