a. 创始的, 遗传的, 起源的, 遗传学的
Genetic studies have made some progress toward identifying their biological roots.
四级 · CET-4 2026年6月 第1套
By comparing identical twins, who share nearly 100 percent of their genes, and non-identical twins, who share about half, researchers have found overwhelming evidence for genetic effects on behaviors.
四级 · CET-4 2026年6月 第1套
According to evolutionary scientists, cooperative behavior may have evolved first among relatives to promote the continuation of their genetic line.
四级 · CET-4 2026年6月 第1套
Yet almost no behavior is entirely genetic, even among identical twins.
四级 · CET-4 2026年6月 第1套
Thus, the degree to which we act cooperatively or selfishly is unique to each individual and depends on a variety of genetic and environmental influences.
四级 · CET-4 2026年6月 第1套