Desmond and deirdre are two biological siblings who are being reared in the same home. their iq scores are much more similar that those of glen and giselle, who are biological siblings who were separated as infants and are being raised in different homes. the fact that the iq scores of desmond and deirdre are much more similar than the iq scores of glen and giselle provides evidence for the influence of _____ on intelligence and iq scores.