A heterozygous tall plant (Tt) is crossed with a short plant (tt). What is the ratio of tall to short offspring?
Answer and explanation
Correct answer: A. 1 : 1
- Step 1: The cross gives Tt, Tt, tt, tt, a 1 : 1 ratio.
Answer
1 : 1.
Why not the others: 3 : 1: this ratio comes from crossing two heterozygous plants. 1 : 3: short offspring cannot be three times as common. All tall: half of the offspring inherit t from both parents and are short.
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