biology exam 3

Question 1

disruptive selection

Answer 1

favors both extreme phenotypes, decreased frequency of average phenotype

Question 2

directional selection

Answer 2

increased frequency for ONE extreme phenotype

Question 3

genetic drift

Answer 3

A change in the gene pool due to chance

Question 4

stablized selection

Answer 4

favors average phenotype, decrease of BOTH extreme phenotypes

Question 5

In _____ isolation, it is physically impossible for two species to mate with each other, often because their genitalia do not fit together properly.

Answer 5

mechanical

Question 6

species

Answer 6

a population of organisms that under natural conditions are able to mate and produce fertile offspring
- doesn’t work for asexual organisms, prokaryotes, or extinct fossil organisms.

Question 7

eastern and western spotted skunks, breed at different times of the year, a reproductive barrier called

Answer 7

temporal isolation

Question 8

the male and female genitalia fit together like a lock and key. Those with the wrong key cannot mate.

Answer 8

mechanical isolation

Question 9

meadowlarks have different abilities to sing different particular songs
the two types are isolated by a force called

Answer 9

behavioral mechanism

Question 10

different ticks live on different types of hosts

Answer 10

habitat isolation

Question 11

temporal, behavioral, habitat, mechanical isolation

Answer 11

prezyogtic barriers

Question 12

sterile hybrid of female donkey and male horse

Answer 12

reduced hybrid fertility

Question 13

lion-tiger hybrids don’t live to reach maturity

Answer 13

reduced hybrid viability

Question 14

The science of naming, identifying, and classifying organisms is called ________

Answer 14

taxonomy

Question 15

The tailbone of a human ________ to the tail of a monkey.

Answer 15

homologous