Evoltuion 3

Question 1

natural selection in a nut shell

Answer 1

too many offspring
compeition for limited resources
individuals show variation
survival: have better variations, better compete, can survive
people with bneficial variation need to reproduce for next generation

Question 2

stabilizing

Answer 2

form of natural selection, intermediate phenotype favored, extreme eliminated

Question 3

example of stabilizing

Answer 3

human birth weight, clutch size (number of eggs) in birds

Question 4

disruptive

Answer 4

form of natrual selection, opposite of stabilizing, intermediate eliminated, extreme favored

Question 5

example of disruptive

Answer 5

size of bird beaks (smal and large, small = soft seeds, large = harder seeds)

Question 6

sexual selection

Answer 6

form of natural selection, mates chose mates for specific reasons

Question 7

example of sexual selection

Answer 7

change gravel, evolve into background, dominant selection pressure

MATE CALL

Question 8

directional

Answer 8

one phenotype over time replaced by another phenotyep

Question 9

example of directional

Answer 9

peppered, guppy experiment, european black bear (during period of galciation european black bear become bigger

Question 10

selection pressure

Answer 10

something in habitat that favor one variation over another

Question 11

example of selection pressure

Answer 11

gravel, predator, female

Question 12

specieis

Answer 12

individual of same type that are inner breeding and produce fertible offspring

Question 13

speciation

Answer 13

evolution of a new species, two main types

Question 14

allopatric

Answer 14

requires geographic isolation barrier

Question 15

example of allopatric

Answer 15

darwins finches: each island has specific beaks for specific food on island, evolved from blue grass glass finch

Question 16

allopatric devlopment

Answer 16

gene flow because can cross river, then over time stream became geopgrahic barrier = NO GENE FLOW, geographic isolation, differenect selection pressures occur on both sides, different variations accumulating, natrual selection, become repdouctively isolated (can’t and will not mate)= considered two different species

Question 17

Type of gene drift

Answer 17

Bottle neck and founder