A particular pea plant has one allele for a tall stem (T) and one allele for a short stem (t). By observing it, you can see that it has a tall stem as well as many other different traits.Using this example, explain the difference between phenotype and genotype. Which one can be observed? Which one helps to determine the other?
Question
A particular pea plant has one allele for a tall stem (T) and one allele for a short stem (t). By observing it, you can see that it has a tall stem as well as many other different traits.Using this example, explain the difference between phenotype and genotype. Which one can be observed? Which one helps to determine the other?
Solution
In genetics, the terms "phenotype" and "genotype" are used to describe the observable physical properties of an organism (phenotype), and the set of genes responsible for these traits (genotype).
In your example, the pea plant's genotype is Tt. This is the genetic makeup of the plant, which you cannot observe just by looking at the plant. The genotype is determined by the alleles that the plant inherits from its parents. In this case, it has inherited one allele for a tall stem (T) and one allele for a short stem (t).
The phenotype, on the other hand, is the observable physical properties of the plant. In this case, the plant has a tall stem. This is the trait that you can observe. The phenotype is determined by the genotype and the environment. In this case, the genotype (Tt) has resulted in a tall stem phenotype.
So, to answer your questions: The phenotype (the physical traits) can be observed. The genotype (the genetic makeup) helps to determine the phenotype.
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