Question

In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant that is rrtt,

• A. 75% will be tall with red fruit.
• B. All the offspring will be tall with red fruit.
• C. 25% will be tall with red fruit.
• D. 50% will be tall with red fruit.

Answer 1

The correct option is D 50% will be tall with red fruit.

The cross can be represented as shown in the figure.

Hence the ratio of offspring are:

Red Tall : Red Short = 1:1

So, percentage of tall plants with red fruits = 50% and percentage of short plants with red fruits = 50%

So, the correct answer is '50% will be tall with red fruit'.