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?
0% red : 100% pink : 0% white
25% red : 50% pink : 25% white
33% red : 33% pink : 33% white
50% red : 0% pink : 50% white
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The original plants are red and white. With alleles displaying incomplete dominance, you know that heterozygous plants, Rr, will be neither red nor white, but instead will be pink.
Knowing that, the original plants must be homozygous dominant and recessive. RR, red plant, and rr, white plant. All of their offspring will be heterozygous, Rr, and be pink.
So this question just wants you to answer the color ratio resulting from a crossing of two heterozygous, pink plants.
Complete the table. Then, knowing that RR will be red, rr will be white, and Rr will display incomplete dominance in the form of a pink color, you should be able to tell the ratios.