Question

Two true-breeding snapdragon (Antirrhinum majus) plants, one with red flowers and another with white flowers were crossed. The F1 plants were all with pink flowers. When the F1 plants were selfed, they produced three kinds of F2 plants with red, pink and white flowers in a 1:2:1 ratio. The probability that out of the five plants picked up randomly, two would be with pink flowers, two with white flowers and one with red flowers is _____%.

Answer 1

red flower is 25 per cent

Answer 2

One with red flowers is 0.39 %

Explanation:

F1 generation plants will have genotype Rr and phenotype pink

In F2 generation on selfing

   R   r

R RR Rr

r  Rr   rr

1:2:1

1 red 2pink 1 red

In the question it is given on plant is with red flower.

The probability of five plants picked up randomly are for pink 1/2

 for red=1/4

for white =1/4

The probability according to the occurrence in the five plants.

so, the probability Will be 1/2^2.1/4^2.1/4

   = 1/256

0.39%

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