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Biology Honors Semester 2 Final Exam > U4P1 > Flashcards

Flashcards in U4P1 Deck (27)
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1

age of the earth

4.5 billion years old

2

Darwin observed

different species of finches observed came from Galapagos Islands and shared common ancestor

3

adaptation

process by which a population becomes better suited to its environment

4

descent with modification

occurs because of natural selection

5

natural selection

process by which organism with traits more suitable survives and reproduces more successfully

6

parts of natural selection

overproduction, genetic variation, struggle to survive, differential reproduction

7

how do populations of same species living in different places adapt in relation to one another

adapt to different things due to differing environments

8

three vestigial structures in humans

tailbone, appendix, Darwin's point

9

occurrence of same of very similar amino acid sequence for a protein in a group of species

provides evidence that these species share a common ancestor

10

do acquired characteristics provide evidence for evolution

no, acquired characteristics are not inherited

11

natural selection acts on

phenotypes

12

gene flow

movement of alleles into or out of a population

13

3 things needed for evolution to take place

genetic drift, gene flow, mutations, nonrandom mating, natural selection

14

genetic drift

random change in allele frequency in a population

15

gene flow

movement of genes into or out of a population due to interbreeding

16

mutations

change in the nucleotide-base sequence of a gene or DNA molecule

17

nonrandom mating

when individuals prefer mates with particular superior physical characteristics

18

natural selection

process by which individuals that are better suited for their environment survive and reproduce more frequently than those that are not

19

since natural resources are limited

all organisms must compete

20

analogous structure

structure that evolves independently but serves the same function

21

what may cause variation in genotype

mutations, genetic recombination, independent assortment, environment

22

what kind of population is most fit

large

23

why has DDT become useless

natural selection acted on those without the DDT resistant gene and DDT resistant have survived and reproduced more frequently

24

natural selection is the...

largest and most influential force driving evolution

25

sexual selection

occurs when a mate chooses a sexual partner based on some trait

26

emigration

organisms move out of an area, causes gene flow

27

immigration

organisms moving into an area, causes gene flow