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(a) Determine 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.

Fine spines (s), smooth fruit (tu), and uniform fruit color (u) are three recessive traits in cucumbers whose genes 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 from this testcross:

(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.

*24. In Drosophila melanogaster, black body (b) is recessive to gray body (b+), purple eyes (pr) are recessive to red eyes (pr+), and vestigial wings (vg) are recessive to normal wings (vg+). The loci coding for these traits are linked, with the following map distances:

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