Which of the following are the two main types of phenotypes?

The primary types of phenotypes are classified as dominant and recessive, which corresponds perfectly with the provided answer. Dominant phenotypes exhibit traits that can overshadow the effects of recessive alleles. This means that if an individual carries at least one dominant allele for a particular trait, that trait will be expressed in the phenotype. For example, in pea plants, the allele for purple flowers is dominant over the allele for white flowers; thus, a plant with one purple allele will display purple flowers.

On the other hand, recessive phenotypes only manifest when an individual has two recessive alleles for that trait. Using the previous example, only plants with two alleles for white flowers will exhibit that color phenotype. This relationship between dominant and recessive alleles is fundamental to Mendelian genetics and helps explain how traits are inherited across generations.

The other options refer to characteristics that do not categorize phenotypes in the same way. Intermediate and codominant representations involve different expressions of traits rather than distinct phenotype classifications. Autosomal and sex-linked refer to the chromosomal basis of gene inheritance rather than the traits expressed phenotypically. Understanding these classifications is vital for studying genetic inheritance and the expression of traits in offspring.