Historia

As natural selection acts on a population, the amount of variation in the population should
Answer
| | increase. |
| | decrease. |
| | remain the same. |

A primary source for new,unique genes in a population is
Answer
| | artificial selection. |
| | natural selection. |
| | mutation. |
| | virus infection. |
| | crossing over. |
In a population, whichindividuals are most likely to survive and reproduce?
Answer
| | The individuals who are best adapted to the environment. |
| | The largest individuals in the group. |
| | The individualswho grow the most rapidly. |
| | The individuals who can catch the most prey. |
| | The individuals who are the most different from the others in the population. |

The evolution of a longneck in giraffes is an example of
Answer
| | diversifying selection. |
| | directional selection. |
| | stabilizing selection. |

Which of the following shows events in the proper orderto reflect how natural selection works?
Answer
| | A louse population evolves resistance to permethrin; permethrin is used to kill lice; lice become more common in schoolchildren. |
| |Permethrin resistance is common is lice; permethrin is used to kill lice; most lice become sensitive to permethrin. |
| | Louse populations become more common in schoolchildren; some lice are resistantto permethrin; permethrin is used to kill lice; lice resistant to permethrin become the most common type. |
| | Permethrin is used to kill lice; individual lice change in order to surviveexposure to permethrin; most lice become resistant to permethrin.Drug resistance to anti-HIV drugs is a serious problem. Which of the following facts about HIV is the most direct reason why drug resistanceappears so rapidly?Answer | | It has a high rate of mutation. |
| | It's replicated in T cells. |
| | It's a virus. |
| | It's sexually transmitted. |
| | It's found in the blood....