The height of a certain plant is determined by a dominant allele T corresponding to tall plants and a recessive allele t corresponding to short (or dwarf) plants. If both parent plants have genotype Tt, compute the probability that the offspring plants will be tall. Hint: Draw a Punnett square.
In a Punnett square, we can represent the possible genotypes of the offspring plants by crossing the genotypes of the parent plants.
The parent plants both have the genotype Tt. When we cross them, we get the following Punnett square:
T t
T TT Tt
t Tt tt
From this Punnett square, we can see that there are 2 offspring plants with the genotype TT (tall) out of a total of 4 possible combinations. Therefore, the probability that the offspring plants will be tall is 2/4 = 0.5 or 50%.