Allelic variation at the insulin growth factor-1 gene is one of several variables that affect body size in dogs.Based on this information, one can say that this gene
A) displays heterosis.
B) is a quantitative trait locus.
C) is a pleiotropic gene.
D) is a quantitative trait locus and displays heterosis.
E) is a quantitative trait locus and is pleiotropic.

Question

Quizplus · Accepted Answer

The fact that allelic variation at the insulin growth factor-1 gene affects body size in dogs indicates that it is a quantitative trait locus, a gene that influences quantitative traits such as size, weight or height. None of the information provided suggests that the gene displays heterosis or pleiotropy, so options A, C, D and E can be eliminated.

Allelic Variation at the Insulin Growth Factor-1 Gene Is One