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Incomplete dominance is shown in the fruitloop flower, WW are white, RR are red and WR are pink. Use scratch paper to set up a Punnett square for a cross of two of the F1 generation (pink flowers). What is the percentage of white flowered offspring in the F2 generation of the cross between two pink flowering fruitloop plants? a 100% white b 75% white c 50% white d 25% white e 0% white

1 answer

In incomplete dominance, the genotypes and phenotypes can be represented as follows for the flower color of the Fruitloop plant:

  • WW = white flowers
  • RR = red flowers
  • WR = pink flowers

When we cross two pink flowering plants (WR x WR), we can set up a Punnett square:

      W     R
    --------------
W |   WW   |  WR  |
    --------------
R |   WR   |  RR  |
    --------------

From the Punnett square, we can see the possible genotypes and their corresponding phenotypes:

  1. WW = white flowers (1)
  2. WR = pink flowers (2)
  3. RR = red flowers (1)

So the genotypic ratio from this cross is:

  • 1 WW (white)
  • 2 WR (pink)
  • 1 RR (red)

To find the percentage of offspring with white flowers (WW), we calculate:

  • Total offspring = 1 (WW) + 2 (WR) + 1 (RR) = 4
  • Percentage of white flowers = (Number of WW / Total offspring) x 100 = (1 / 4) x 100 = 25%

Therefore, the percentage of white flowered offspring in the F2 generation is 25%.

The correct answer is d) 25% white.