Transgenic Organisms Are Used to Clarify Which Gene May Be

Multiple Choice

Transgenic organisms are used to clarify which gene may be responsible for a mutant phenotype because

A) individuals with a mutant phenotype can carry mutations in more than one gene.
B) the genes that cause diseases are always dominant.
C) the genes that cause diseases are always recessive.
D) strains used to create transgenic organisms carry no mutations and all their genes are wild-type.