A geneticist cross-fertilized the different pea plants that differ in only one character to produce F₁ offspring. He then allowed the F₁ to self-fertilize to raise the F₂ generation. The following ratios were then obtained from a large F₂ generation: 

P. 50/48   Tall, short 

Q. 78/26  Tall, short 

R. 99/0    Tall, short 

S. 0/77    Tall, short

Assuming that the allele for tallness (T) is dominant over the allele for shortness (t), identify the option that includes the offspring with both parents being heterozygous for one trait.