You can physically see the of a trait, but not the .

1.) a. phenotype
b. genotype

2.) a. genotype
b. phenotype

The correct answer for the blank is -

1.) A. Phenotype

B. Genotype

Phenotype corresponds to the physical appearance of a particular characteristic or morphological form in an individual.

Example - Hair color, plant height, skin color.

On the other hand, genotype corresponds to the genetic makeup of an individual. It is depicted by the gene that is present in the individual organism. Example- Genotype for dwarf height in pea plant is 'tt', which carries both recessive gene variants.

Thus, we can physically see the phenotype of a trait, but not the genotype.