Question

#6 what does it mean for a trait to be dominant vs. recessive? #9

Explanation:

A dominant trait is expressed in an organism if at least one copy of its corresponding dominant allele is present in the genotype. A recessive trait is only expressed when the organism has two copies of its corresponding recessive allele (no dominant allele for that trait is present). Dominant alleles mask the expression of recessive alleles in heterozygous genotypes.

Answer:

A dominant trait is expressed when at least one dominant allele is present in an organism's genotype, as dominant alleles mask recessive ones. A recessive trait is only expressed when an organism has two copies of the recessive allele (homozygous recessive genotype), with no dominant allele to override it.