Question

define genotypes and phenotypes quick check
what is an allele? (1 point)
a form of a gene
the location of a gene on a chromosome
the trait a gene controls
a dominant form of a gene

Explanation:

An allele is a form of a gene. Genes can have different alleles, which can lead to variations in traits. For example, in pea plants, the gene for flower color can have an allele for purple flowers and an allele for white flowers. The location of a gene on a chromosome is called a locus. The trait a gene controls is what we observe (like flower color), and alleles can be dominant or recessive, but an allele itself is just a form of a gene, not specifically a dominant form.

Answer:

a form of a gene