Three dominant traits of corn seedlings, tunicate seed ( T -), glossy appearance

Question

Three dominant traits of corn seedlings, tunicate seed (T -), glossy appearance (G -), and liguled stem (L -), are studied along with their recessive counterparts, nontunicate (tt), nonglossy (gg), and liguleless (ll). A trihybrid plant with the three dominant traits is crossed to a nontunicate, nonglossy, liguleless plant. Kernels on ears of progeny plants are scored for the traits, with the following results:Calculate the recombination frequency between the linked genes from the data presented.

Explanation / Answer

The genes are present on two chromosomes

T G L t g l

- - - t g l

If there is no recombination, the progeny will have same genotype as parents.

T G L t g l

t g l - - -

If the recombination happens at one locus

T - - t g l

- G L t g l

If the recombination happens at two-locus

T - L t g l

- G - t g l

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