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 i crossed to a nontunicate, nonglossy, liguleless plant. Kernels on ears of progeny plants are scored for he traits, with the following results :

Phenotype Number

Tunicate, glossy, liguled 102
Tunicate, glossy, liguleless 106
Tunicate, nonglossy, liguled 18
Tunicate, nonglossy, liguleless 20
Nontunicate, glossy, liguled 22
Nontunicate, glossy, liguleless 23
Nontunicate, nonglossy, liguled 99
Nontunicate, nonglossy, liguleless 110
500

a) Is there evidence of genetic linkage among any of these gene pairs? If so, identify the evidence.

b) Is there evidence of independent assortment among any of these gene pairs? If so, identify the evidence.

c) Using the gene symbols given above, write the genotypes of F1 and F2 plants.

d) If evidence of linkage present, calculate the recombination fraction(s) from the date presented.

e) Could all three genes be carried on the same chromosome? Discuss why and why not.

Explanation / Answer

A) Yes, The results indicate that tunicate and glossy are linked
B) Yes, The results indicate that liguled assorts independently of tunicate and glossy.
C) TG/tg; Ll

D)
E) Yes

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