Chapter 15 Flashcards Preview

Biology > Chapter 15 > Flashcards

Flashcards in Chapter 15 Deck (19):
1

The equilibrium of a gene frequency can be kept constant what are done with the population

No mutations no gene flow and a large population

2

Who gave us the equilibrium equation for population

Hardy Weinberg

3

Who gave us the theory of natural selection

Darwin and Wallace

4

What is defined as the immigration or emigration of organisms genes from a gene pool

Gene flow

5

What is the chance happening that an individual's genes will be eliminated from the gene pool

Genetic drift

6

What is a permanent change in DNA

Mutations

7

What two examples of genetic drift are cited by the author

Founder effect and bottlenecking

8

What is usually a result of some catastrophe, bottlenecking or the founder effect

Bottlenecking

9

What defines a population in equilibrium

No mutations, no gene flow, very large population, all mating is random, no natural selection

10

Does natural selection work on genotypes or phenotypes

Phenotypes

11

Selection can influence populations in three ways what are they

Directional, stabilizing, disruptive

12

What occurs in genetic drift

Part of the population is lost

13

What does the bottleneck effect do

Reduces variation

14

What is an adaptation

A trait that increases the reproductive success of its bearer

15

When does genetic drift occur

When only a random subset of the population reproduces

16

What is the Hardy-Weinberg principle?

Leo frequencies and genotype frequencies in a population will remain constant matter how many generations bass

17

Genetic drift

Process by which a chance events change allele frequencies

18

Population bottleneck

The population size drastically reduce it by an event such as a natural catastrophe or overhunting

19

Founder effect

Occurs when isolated colonies are founded by a small number of organisms