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 corresponding dominant wild-type alleles result in dark leaves (L), round seeds (R), and tall height (T). The results of the three-point test cross are shown in the table.

Part A

Determine which of the following are the parental phenotypic classes.

A) Dark, oval, tall; and Pale, round, short.

B) Pale, oval, tall; and Dark, round, short.

C) Dark, oval, short; and Pale, round, tall.

D) Pale, oval, short; and Dark, round, tall.

Part B

determine which of the following are the double crossover phenotypic classes.

A) Dark, oval, short; and Pale, round, tall.

B) Pale, oval, short; and Dark, round, tall.

C) Pale, oval, tall; and Dark, round, short.

D) Dark, oval, tall; and Pale, round, short.

Part C

What is the correct order of the three genes? (Remember to compare the parental and double-crossover classes.)

A) L

Phenotype Number Pale, round, tall 648 Pale, oval, tall 64 Pale, round, short 10 Pale, oval, short 102 Dark, oval, tall 6 Dark, oval, short 618 Dark, round, short 84 Dark, round, tall 98 1630

Explanation / Answer

Based on the given data,

Hence, the cross was made between the wild type pure-breeding soybean plant with the recessive phenotypes. So, the parental genotypes are: LLRRTT

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