Question

Snapdragon plants with red flowers were crossed with snapdragon plants with white flowers. The F1 plants all produced pink flowers. F1 plants were crossed to produce the F2 hybrid generation as shown:



image


If 30 offspring were produced, how many in the F2 generation would MOST LIKELY be pink?



A.
8

B.
15

C.
30

D.
60

Answer 1

Answer: B — 15.

Explanation: Red (RR) × white (WW) shows incomplete dominance, giving RW = pink in F1. RW × RW in F2 yields genotype ratio 1 RR : 2 RW : 1 WW, so 2/4 of offspring are pink. 2/4 × 30 = 15.