AaBbCcDd is crossed with a plant of identical genotype. The genes assort ibit si

Question

AaBbCcDd is crossed with a plant of identical genotype. The genes assort ibit simple dominance. Simple gene interaction occurs among the four genes C. A plant ofgenotype independenty and allele in any three of the four genes results in a blue phenotype. Having at least one Having a dominan dominan t allele in the four genes results in a purple phenotype. be blue? Use simple probability rules to find the answer; not a probability tree. Show your What fraction of the progeny of the cross will calculations below. (6 pts)

Explanation / Answer

Answer:

AaBbCcDd x AaBbCcDd

Aa x Aa = A_ (3/4) & aa (1/4)

Bb x Bb = B_(3/4) & bb(1/4)

Cc x Cc = C_(3/4) & cc(1/4)

Dd x Dd = D_(3/4) & dd (1/4)

A_B_C_dd = ¾ * ¾ * ¾ * ¼ = 27/64

A_B_ccDd = ¾ * ¾ * ¼ * ¾ = 27/64

A_bbC_Dd = ¾ * ¼ * ¾ * ¾ = 27/64

aa B_C_D_ = ¼ * ¾ * ¾ * ¾ = 27/64

The probability of blue color = 27/64 + 27/64 + 27/64 + 27/64 = 108/64 = 27/16 = 1.6875

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