Q1 Head in the CloudsGiraffes are the tallest animals on land. An adult giraffe has a neck that exceeds 2 m in length.This neck enables a giraffe to access food that other animals cannot reach and detectpredators from a long distance. Studies have shown that giraffes will browse trees at heightsthat other herbivores cannot reach. The water and nutrients gained from leaves enhance agiraffe's fitness by increasing survival and reproduction. However, a long neck comes with acost: the heart must spend more energy to pump blood to the brain. If a giraffe's neck were toolong, the energy required to circulate blood would exceed the energy gained from eating leaves.1. In a population of giraffes, the average length of the neck is under stabilizing selection.TrueFalse

True A extremely short neck makes feeding difficult, whereas a very long neck increases the energy required for circulation. As a result, the neck is subject to stabilising selection, with middle necks conferring the best fitness. Stabilising selection is opposite of thet of disruptive selection. It prefers intermediate variations rather than those with extreme traits. Stabilizing selection tends to eliminate the more severe phenotypes, which result in the reproductive success of the more moderate or average phenotypes. There are three type of natural selection Stabilizing Selection Directional Selection Disruptive Selection Stabilizing selection : This form of natural selection happens when selective forces act against two extremes of a characteristic, causing the intermediate or "middle" feature to be selected for. Directional Selection : When selective forces favour one extreme of a characteristic, this sort of natural selection arises. Disruptive Selection : This form of natural selection arises when selective forces favour the two extremes while opposing the middle characteristic.