Question

Due to the cross between TTRr and ttrr the resultant progenies showed how many percent plants would be tall, red flowered?

• A. 50%
• B. 75%
• C. 25%
• D. 100%

Answer 1

Answer: (A)

50%

• Let us consider TTRr as male gametes and ttrr as female gametes.
• TTRr gives 4 alleles (TR, Tr, TR, Tr) and ttrr gives tr, tr, tr, tr.
• When this both male and female gametes are crossed, it resulted in 16 progenies. Out of 16 progenies, 8 progenies (TtRr) are tall and red-flowered (50% are tall and red flowered), and 8 progenies (Ttrr) are tall and white-flowered.

So, the correct answer is 50%.