Chapter17 Flashcards Preview

Bio > Chapter17 > Flashcards

Flashcards in Chapter17 Deck (21):
0

The number of times That an allele occurs In a gene pool compared with the number of alleles in that pool for the same gene

Allele frequency

1

Form of reproductive isolation in which two populations develop differences in courtship rituals or other behaviors that prevent them from breeding

Behavioral isolation

2

A change in allele frequency on a dramatic reduction in the size of a population

Bottleneck effect

3

Form of natural selection when individuals at one end of a distribution curve have higher fitness that individuals in the middle or at the other and of the Curve

Directional selection

4

Natural selection in which individuals at the upper and lower ends of the curve have higher fitness than individuals near the middle of the curve

Disruptive selection

5

Change in allele frequencies as a result of the migration of a small subgroup of a population

Founder effect

6

All the genes including all the different alleles for each gene that are present in a population at any one time

Gene pool

7

Random change in allele frequency caused by a series of chance occurrences that cause and allele to become more or less common in a population

Genetic drift

8

Situation in which allele frequency in a population remain the same

Genetic equilibrium

9

Forn of reproductive isolation in which two populations are separated by geographic barriers such as rivers mountains or bodies of water leading to the formation of two separate subspecies

Geographic isolation

10

Principle that states that all allele frequencies in a population remain constant unless one or more factors cause those frequencies to change

Hardy-Weinberg principle

11

Method used by researchers that uses mutation rates in DNA to estimate the length of time that two species have been evolving independently

Molecular clock

12

Traits controlled by two or more genes

Polygenic trait

13

Number of times than an allele occurs in a gene pool compared with the number of times other alleles for the same gene

Relative frequency

14

Separation of a species or population so that they no longer interbreed and evolve into two separate species

Reproduction isolation

15

When individuals select mates based on heritable trait

Sexual selection

16

Trate controlled by one gene that has two alleles

Single-gene trait

17

Formation of a new species

Speciation

18

A group of similar organisms that can breed and produce fertile offspring

Species

19

Form of natural selection in which individuals near the center of the distribution curve have higher fitness where individuals of either end of the curve

Stabilizing selection

20

Form of reproductive isolation in which two or more species reproduces at different times

Temporal isolation