In tomato plants, the tall vine allele (T) is dominant to the short vine allele (t). Two tomato plants are crossed. Among the offspring plants grown from seed, 50% have tall vines and 50% have short vines.What are the most likely genotypes of the parent plants?
Question
In tomato plants, the tall vine allele (T) is dominant to the short vine allele (t). Two tomato plants are crossed. Among the offspring plants grown from seed, 50% have tall vines and 50% have short vines.What are the most likely genotypes of the parent plants?
Solution
The most likely genotypes of the parent plants are Tt and Tt.
Here's why:
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We know that the tall vine allele (T) is dominant. This means that a plant with either TT or Tt genotype will have tall vines. A plant will only have short vines if it has the tt genotype.
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If 50% of the offspring plants have tall vines and 50% have short vines, this suggests that each parent plant is contributing one dominant allele (T) and one recessive allele (t) to the offspring.
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The only way for this to happen is if both parent plants have the Tt genotype. This way, there's a 50% chance that an offspring plant will inherit a T from both parents (resulting in a TT genotype and tall vines), a 25% chance that it will inherit a T from one parent and a t from the other (resulting in a Tt genotype and tall vines), and a 25% chance that it will inherit a t from both parents (resulting in a tt genotype and short vines).
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However, since TT and Tt both result in tall vines, we can combine these probabilities and say that there's a 50% chance of an offspring plant having tall vines and a 50% chance of it having short vines, which matches the information given in the question.
So, the most likely genotypes of the parent plants are Tt and Tt.
Similar Questions
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