Answer:
A is false
Step-by-step explanation:
Phenotype is the appearance while genotype is the genetic composition of a specific trait. You cannot determine the genotype of an individual by its phenotype
For example, if a true breed yellow pea plant (YY) is crossed with a true breed green pea plant (yy), all the individuals in the next generation will be hybrid yellow pea plants (Yy) because yellow colored peas are dominant which mask the green color of the other peas.
Hence, looking at the yellow color of the pea plants, you will not be able to tell if they are homozygous (YY) or heterozygous (Yy) because they will both have yellow colored peas.