Tool that allows the user to determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish. Keys<span> consist of a series of choices that lead the user to the correct name of a given item. "</span>Dichotomous<span>" means "divided into two parts".</span>
answer: You inherit a copy from one parent, and the other copy from the other parent.
"Skin color is a classic variable trait in humans, and it's thought to be adaptive," Tishkoff said. "Analysis of the genetic basis of variation in skin color sheds light on how adaptive traits evolve, including those that play a role in disease risk."