Question

In a given plant, red colour (R) of fruits is dominant over white fruit (r) ; and tallness (T) is dominant over dwarfism (t). If a plant with genotype RRTt is crossed with a plant of genotype rrtt, what will be the percentage of tall plants with red fruits in the next generation?

• A. 100%
• B. 75%
• C. 50%
• D. 25%

Answer 1

The correct option is C 50%

According to question, tallness (T) is dominant over dwarfism (t) and red colour (R) is dominant over white (r) fruit colour.

Parent Generation; P${}_1$ : RRTt x rrtt

F${}_1$ generation :

Gametes - RRTt rrtt	RT	Rt
rt	RrTt (tall plant, red fruit)	Rrtt (dwarf plant, red fruit)

Phenotypic ratio = 1 (tall plant, red fruit) : 1 (dwarf plant, red fruit); thus, percent of tall plant with red fruit is 50%.