The two parent plants are the p generation, or parent generation. create a punnett square to show their offspring, the f1 generation. part 1 punnett square

For example:

If both parents are with heterozygous genotype Aa (A is dominant allele for the trait and a is recessive allele for the trait) , than

P: Aa  x  Aa, the offspring will be

F1: AA  Aa  Aa  aa (one dominant homozygous, one recessive homozygous and two heterozygous.

the answer is d p: cell, q: organ, r: organ system, s: tissue