Question: Which type of selection tends to increase genetic variation?

Answer: Disruptive selection

Question: Disruptive selection eliminates phenotypes near the ____ and favors the _____ phenotypes, resulting in ____ in a population

Answer: average

extreme

increased genetic variation

Question: In a bell-shaped curve, the x-axis of the graph represents which of the following?

Answer: The value of a particular characteristic; characteristics of an organism can include such traits as size and color and increases from left to right

Question: Heterozygote advantage refers to the tendency for heterozygous individuals to have better fitness than homozygous individuals. This higher fitness results in less genetic variation in the population.

Answer: False; heterozygote advantage result in more genetic variation in the population

Question: Long necks make it easier for giraffes to reach leaves high on trees, while also making them better fighters in “neck wrestling” contests. In both cases, which kind of selection appears to have made giraffes the long-necked creatures they are today?

Answer: Directional selection