Question

the phenotype of an organism....
○ reflects all the traits that are actually expressed.
○ represents its genetic composition.
○ cannot be seen.
○ occurs only in dominant pure organisms.

Explanation:

To determine the correct answer, we analyze each option:

• The first option: Phenotype is defined as the observable (expressed) traits of an organism, including physical, physiological, and behavioral traits. So this option matches the definition of phenotype.
• The second option: The genetic composition of an organism is called its genotype, not phenotype. So this is incorrect.
• The third option: Phenotype includes observable traits, so it can be seen (e.g., eye color, height). Thus, this is wrong.
• The fourth option: Phenotype occurs in all organisms, not just dominant pure ones. Recessive traits can also be expressed in homozygous recessive organisms, and dominant traits can be in heterozygous or homozygous dominant. So this is incorrect.

Answer:

A. reflects all the traits that are actually expressed.