A wild-type trihybrid soybean plant is crossed to a pure-breeding soybean plant

Question

A wild-type trihybrid soybean plant is crossed to a pure-breeding soybean plant with the recessive phenotypes pale leaf l, oval seed (r), and short height (t). The results of the three-point test cross are shown in the table. Traits not listed are wild type.

Part A

What is the genotype of the wild-type trihybrid soybean plant? Use L, R, and T to represent dominant alleles and l, r, and t for recessive alleles.

Part B

Place the alleles in their correct gene order.

a) L-T-R

b) T-L-R

c) L-R-T

a) LtR / lTr b) LTR / ltr c) Ltr / lTR d) LTr / ltR Phenotype Number Pale Pale, oval Pale, short Pale, oval, short 102 Oval Oval, short Short Wild type 648 64 10 618 84 98 1630

Explanation / Answer

Part A:  

Ltr / lTR

Part B:

L-T-R

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