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In a certain plant, the gene for tall height (T) is dominant over the gene for short height (t). The Punnett square shows the results of a cross between a pure tall plant and a pure short plant. What percentage of the offspring would be tall plants?

A.
75%
B.
25%
C.
100%
D.
50%

1 answer

In this cross, we have a pure tall plant (TT) and a pure short plant (tt).

When we set up the Punnett square, we would have:

       T     T
    -------------
 t |   Tt   |  Tt  |
    -------------
 t |   Tt   |  Tt  |
    -------------

All of the offspring (100%) will be Tt, which means they will be tall plants since the allele for tallness (T) is dominant.

Therefore, the percentage of the offspring that would be tall plants is:

C. 100%