Deep in a previously unexplored South American rain forest, a species of plants
ID: 170971 • Letter: D
Question
Deep in a previously unexplored South American rain forest, a species of plants was discovered with true-breeding varieties whose flowers were either pink, rose, orange, or purple. A very astute plant geneticist made a single cross, carried to the F2 generation, as shown.
There are 3 genes involved in determining flower color.
Now that you know that three genes are involved, you can determine all the possible genotypes. For each possible genotype in the F2 generation listed below, calculate the ratio of F2 offspring with that genotype.
purple x pink all purple 27/64 purple 16/64 pink 12/64 rose 9/64 orangeExplanation / Answer
Answer
Aa x Aa= AA (1/4), Aa(1/2), aa(1/4)
A_ = 3/4
Bb x Bb= BB(1/4), Bb (1/2), bb(1/4)
B_ = 3/4
Cc x Cc= CC (1/4), Cc(1/2), cc(1/4)
C_ = 3/4
A_B_C_ = 3/4 * 3/4*3/4 = 27/64
A_B_cc = 3/4 * 3/4*1/4= 9/64
A_bb_C_ = 3/4 * 1/4*3/4 = 9/64
A_bbcc = 3/4 * 1/4*1/4 = 3/64
aaB_C_ = 1/4 * 3/4*3/4 = 9/64
aaB_cc= 1/4 * 3/4*1/4 =3/64
aabbC_ = 1/4 * 1/4*3/4 = 3/64
aabbcc = 1/4 * 1/4* 1/4 = 1/64
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