In humans, a cleft chin is dominant and no-cleft is recessive. What will the generations look like? Assume that Mendel’s method of crossing two true breeding parents with opposite traits is followed. Check all that apply.
Answer
A
The P generation, F1 generation, and F2 generation will have all cleft chins.
B
The P generation, F1 generation, and F2 generation will have all no-cleft chins.
C
The P generation and F1 generation will have all cleft chins.
D
The F1 generation will have all cleft chins.
E
The P generation and F2 generation will have all no-cleft chins.
F
The P generation and F2 generation will have cleft chins and no-cleft chins.
G
The P generation, F1 generation, and F2 generation will have cleft chins and no-cleft chins.
Explanation
Let C represent dominant cleft chin and c represent recessive no-cleft chin. The true-breeding P parents are CC (cleft) and cc (no-cleft), so the P generation includes both traits; all F1 offspring are Cc and have cleft chins. Crossing the F1 offspring produces an F2 generation with both traits, so D and F are correct.
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