In snapdragons, there is one allele that produces red flowers and another allele that produces white flowers. Neither allele is dominant and heterozygous individuals have pink flowers. A plant breeder decides to cross a white-flowered snapdragon with a pink-flowered snapdragon. What is the expected phenotypic ratio among the offspring?Multiple Choice1:13:12:11:2:1
Question
In snapdragons, there is one allele that produces red flowers and another allele that produces white flowers. Neither allele is dominant and heterozygous individuals have pink flowers. A plant breeder decides to cross a white-flowered snapdragon with a pink-flowered snapdragon. What is the expected phenotypic ratio among the offspring?Multiple Choice1:13:12:11:2:1
Solution
The question is about genetics and inheritance, specifically about incomplete dominance. In incomplete dominance, the phenotype of the heterozygous genotype is distinct from and often intermediate to the phenotypes of the homozygous genotypes.
Here's how to solve it:
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Identify the genotypes of the parents. The white-flowered snapdragon has a homozygous recessive genotype (ww), and the pink-flowered snapdragon has a heterozygous genotype (rw).
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Set up a Punnett square. A Punnett square is a simple graphical way of discovering all of the potential combinations of offspring genotypes that can occur and their probability.
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Fill in the Punnett square. The Punnett square for this cross would look like this:
r w w rw w rw -
Determine the phenotypic ratio. The Punnett square shows that half of the offspring will be pink (rw) and half will be white (ww).
So, the expected phenotypic ratio among the offspring is 1:1 (pink:white). Therefore, the correct answer is 1:1.
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