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 u Tu 70 S u Tu 21 u tu 4 S U tu 82 U tu 21 U Tu 13 u tu 17 Total 230 a. Determine the order of these genes on the chromosome. p. Calculate the map distances between the genes. 2. の の
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 u Tu 70 S u Tu 21 u tu 4 S U tu 82 U tu 21 U Tu 13 u tu 17 Total 230 a. Determine the order of these genes on the chromosome. p. Calculate the map distances between the genes. 2. の の
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter13: Genes, Chromosomes, And Human Genetics
Section: Chapter Questions
Problem 8TYK: Another gene in Drosophila determines wing length. The dominant wild-type allele of this gene...
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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.
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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