Phenotype. Genotype is expressed by numbers. Phenotype expresses the physical components.
Explanation:
Make an observation about a phenomenon (qualitative and/or quantitative)
Ask a research question.
Hypothesize a possible answer for your question.
Create a procedure to test your hypothesis.
Identify what you are testing.
Identify your control group/experimental group.
Because what mendel proved was that certain genes skipped the F1 generation and then were present in the F2 generation