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7 April, 13:46

What is the probability that the first offspring from the cross listed below will show the dominant phenotype for all loci? (type as a decimal and round to 5 decimal places) a. AA bb

b. Dd ee x

c. Aa

d. BB dd

e. Ee

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  1. 7 April, 14:11
    0
    0.25000

    Explanation:

    There is an error in the way the question is written, the cross to analyze is:

    AAbbDdee x AaBBddEe

    If the genes assort independently, we can predict separately for each gene the proportion of the offspring that will have the dominant alleles using Mendel's law of segregation.

    AA x Aa

    1/2 AA

    1/2 Aa

    Phenotype: all A

    bb x BB

    1 Bb

    Phenotype: all B

    Dd x dd

    1/2 Dd

    1/2 dd

    Phenotype: 1/2 D, 1/2 d

    ee x Ee

    1/2 Ee

    1/2 ee

    Phenotype: 1/2 E, 1/2 e

    Genes are independent, so the probability of having all dominant phenotype offspring (A_B_D_E_) can be calculated by multiplying for each gene the probabilities of having at least one dominant allele in the offspring:

    1 (A_) * 1 (B_) * 1/2 (D_) * 1/2 (E_) = 1/4 = 0.25
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