Why are scientists having trouble identifying genes that may code for intelligence?
A) The effects of genes and the environment interact too strongly.
B) There may be thousands of contributing genes, some having small effects.
C) Intelligence cannot be defined sufficiently clearly to look for genetic correlates.
D) There are too many sources of environmental influence to control for.

Question

Quizplus · Accepted Answer

Intelligence is believed to be influenced by multiple genes, and the effects of any single gene may be small. Thus, identifying all the genes involved in intelligence is a challenging task that requires screening a large number of genes.

Why Are Scientists Having Trouble Identifying Genes That May Code