NEET 2000 Biology question

Due to the cross between TTRr ttrr the resultant progenies showed how many percent plants tall, red flowered :

(1)50%Correct
(2)75%
(3)25%
(4)100%

Answer: (1)

Solution

Treat each gene separately. TT tt gives all Tt (100% tall). Rr rr gives 1/2 Rr (red) and 1/2 rr (white). Assuming T = tall and R = red are dominant, the progeny that are

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Question ID VK-088643