Fine spines (s), smooth fruit (tu) and uniform fruit color (u) are 3 recessive t

Question

Fine spines (s), smooth fruit (tu) and uniform fruit color (u) are 3 recessive traits in cucumbers, the genes of which are all linked on the same chromosome. A cucumber plant heterozygous for all three traits is used in a testcross, and the following progeny (given in the table below) are produced from this testcross.

a. Use these data to determine which gene (S, U or Tu) is in the middle. ONLY write the gene in the middle, NOT the 3 genes in the correct gene order

b. Calculate the map distance between S and Tu. Round your answer to 1 decimal place. Enter only the map distance, NOT the unit.

Explanation / Answer

Hi,

A) Since Tu differs from the nonrecombinants and the double crossovers, Tu is the middle gene.

B) Recombinants are S Tu and s tu for S-Tu distance

S-Tu Distance = (2 + 4 + 21 + 21)/230 = 48/230 = 20.9% or 20.9 m.u

Hope this solves your query

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