NEET 2004 Biology 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 :

(1)50% will be tall with red fruitCorrect
(2)75% will be tall with red fruit
(3)All the offspring will be tall with red fruit
(4)25% will be tall with red fruit

Answer: (1)

Solution

The parent RRTt produces gametes RT and Rt in equal numbers (1/2 each), and rrtt produces only rt gametes. The offspring are therefore RrTt (red, tall) and Rrtt (red, short) in a 1 : 1 ratio.

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Question ID VK-089509