Based on Mendel's experiment
1) Phenotype - An organism showcasing its morphological characters refers to the phenotype of an organism. For example, tall plants, short plants, green and yellow seeds, yellow and wrinkled seeds are some morphological characteristics of a pea plant.
2) Pure line - It refers to the pure breeding varieties produced due to the cross of self - pollination. For example, the crossing of tall and tall plants will only produce tall plants.
3) Expressed character - It refers to the character that is dominant.eg: among tall and dwarf, tall is the expressed character.
4) Allele - Alternate form of genes that are responsible for a character.