Recent Research Investigating Variation in Human Height Have Found That

Multiple Choice

Recent research investigating variation in human height have found that a variety of genes at different loci,as well as early nutrition,especially that of the mother during gestation (the period of time during development of a fetus) and childhood years,influence height.Given this information,which of the following is correct?

A) Phenotypes are directly linked to genotypes and not influenced externally.
B) Phenotypes are usually the result of a combination of genes as influenced by the environment.
C) One phenotypic trait is usually related to one gene.
D) For human height,the environment is more influential than inheritance of particular alleles.