Which describes a trait from a recessive gene? a) it causes a mutation. b) it masks a dominant gene trait. c) it can appear if it is heterozygous. d) it usually appears only if it is homozygous.

D

Explanation:

A recessive trait is usually the phenotype of the gene allele that is masked by the other dominant allele of the same gene loci. Therefore, for its phenotype fo be exhibited in the individual, it has to occur in the homozygous state in the genotype. Usually, the recessive gene is associated with a malfunctioning gene hence causes disorder in the homozygous state.

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.

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