In pea plants, tall (T) is dominant over dwarf (t). What proportion of the offspring of the cross Tt x Tt will be tall?
- A. 3/4
- B. 1/4
- C. 1/2
- D. All of them
Explanation
The cross gives TT, Tt, Tt and tt, so three of four genotypes contain a dominant allele and appear tall. Only the tt quarter is dwarf, which is the origin of the famous 3:1 phenotypic ratio.
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