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.

Question

Quizplus · Accepted Answer

Transgenic organisms can help identify the gene responsible for a mutant phenotype by introducing a normal (wild-type) gene into an organism with a mutant phenotype. If the introduced gene corrects the phenotype, it suggests that the gene is responsible for the observed mutation. This is useful especially because individuals with a mutant phenotype might have mutations in multiple genes, and transgenesis helps pinpoint the specific gene(s) involved.

Transgenic Organisms Are Used to Clarify Which Gene May Be