Question

A type of plant that produces red flowers is crossed with a plant that produces white flowers. The alleles for flower color exhibit incomplete dominance, and all of their offspring have pink flowers. If two of the pink-flowered offspring were crossed, which of the following ratios of red, pink, and white flowers would you find in their offspring?
Answer
0% red : 100% pink : 0% white

25% red : 50% pink : 25% white

33% red : 33% pink : 33% white

50% red : 0% pink : 50% white

Answer 1

The answer is 25% red : 50% pink : 25% white

A - allele for red flowers
a - allele for white flowers

AA - flowers with red flowers
Aa - flowers with pink flowers
aa - flowers with white flowers

The cross looks like:
Parents:          Aa     x     Aa
Offspring:    AA    Aa   Aa    aa

Red flowers (AA): 1/4 = 0.25 = 25%
Pink flowers (Aa): 2/4 = 0.50 = 50%
White flowers (a): 1/4 = 0.25 = 25%

Answer 2

25 percent red : 50 percent pink : 25 percent white