Answer:
The answer is 1/2.
Step-by-step explanation:
Using a Mendelian cross, the two possibilities for an offspring to become heterozygous is when a parent is heterozygous recessive and the other is heterozygous dominant or vice versa.
If the case is 1/2 heterozygous dominant x 1/2 heterozygous recessive then the offspring will have 1/4 dominant and recessive genotype.
If the case is 1/2 heterozygous recessive x 1/2 heterozygous dominant then the offspring will have 1/4 recessive and dominant genotype.
So the probability totally is 1/2.
I hope this answer helps.