Fine spines (s), smooth fruit (tu), and uniform fruit color (u) are three recess

Question

Fine spines (s), smooth fruit (tu), and uniform fruit color (u) are three recessive traits in cucumbers. The genes responsible for these three traits are linked on the same chromosome. A plant heterozygous for the recessive and dominant alleles at all three genes is used in a testcross and the following progeny are produced. What is the genetic map distance between the S and Tu genes? (The calculator function on your workstation is available.) A 2.6 map units B 13.0 map units C. 15.7 map units D 18.3 map units E. 20.9 map units

Explanation / Answer

S - Tu distance : Recombianants are S - Tu and s - tu

Identifying the recombinants :

S Tu - 2

S Tu - 13

s tu - 4

s tu - 17

Total of recombinants- 36

Genetic map distance : 36 / 230 = 15.7 map uits

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