In some types of wheat, color is caused by two sets of alleles. To produce a red

Question

In some types of wheat, color is caused by two sets of alleles. To produce a red color, both dominant alleles, (R) and (B), are needed. White results from both 13. recessive alleles in the homozygous state, (rbb),. Any other combination will produce brown wheat grains. A strain with a genotype of (Rrbb) is crossed with a strain of wheat with a genotype of (rrBb). What is the color of each of the parent strains? What color wheat will result from this cross and what is the probability for each color? Rrbb color rrBb color

Explanation / Answer

13.

Both parents (Rrbb and rrBb) strains are brown in color.

Rrbb x rrBb

Gametes of Rrbb - Rb, Rb, rb, rb

Gametes of rrBb - rB, rb, rB, rb

Red, brown and white color wheat grains are produced from this cross.

Probability of red wheat grains- 4:16 = 1:4

Probability of white wheat grains- 4:16 = 1:4

Probability of brown wheat grains- 8:16 = 1:2

Rb Rb rb rb rB RrBb (red) RrBb (red) rrBb (brown) rrBb (brown) rb Rrbb (brown) Rrbb (brown) rrbb (white) rrbb (white) rB RrBb (red) RrBb (red) rrBb (brown) rrBb (brown) rb Rrbb (brown) Rrbb (brown) rrbb (white) rrbb (white)

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