b2

Question 1

prezygote/ before the zygote/ mating

Answer 1

prevents fertilization

Question 2

habitat isolation

Answer 2

type of prezygotic factor
species live in different areas that’ll never meet so they don’t mate
eg. land snake vs water snake

Question 3

mechanical isolation

Answer 3

physical attributes prevent mating

Question 4

behavioural isolation

Answer 4

rituals to attract mates, sometimes doesn’t work

Question 5

sources of genetic variation

Answer 5

mutations: change in dna, random

sexual reproduction: mom and dad mix alleles to make combination

asexual reproduction: cloning ur genes lmfao what

Question 6

why is genetic diversity important

Answer 6

rich ecosystem
better for adaptation

Question 7

lamarks theory

Answer 7

parts of body’s are used more than others
they grow stronger and bigger
gets passed down to offsprings
not really accurate lmfao

Question 8

darwin’s theory

Answer 8

theory of natural selection
those who are the best fit for the weather/ season/ conditions will live

Question 9

evidence of evolution: fossils

Answer 9

most direct evidence of evolution

Question 10

evidence of evolution: biogeography

Answer 10

geography in the past and present
species who are similar but live in different places were close to each other geographically

Question 11

evidence of evolution: anatomical

Answer 11

comparing species bone structure to find similar ancestor
eg. finding similar useless bones between 2

Question 12

evidence of evolution: embryological

Answer 12

comparing embryos
similarities between fertilized cells and growth

Question 13

evidence of evolution: bio chemical

Answer 13

dna and chromosomes similarities means more closely related

Question 14

evidence of evolution: artificial selection

Answer 14

similar plants share breeding ancestor

Question 15

gradualism

Answer 15

gradual adaptive features change slowly overtime

Question 16

punctuated equilibrium

Answer 16

changes in species are quick
eg. bird gizmo

Question 17

patterns of speciation

Answer 17

there are 2 ways speciation can happen:
1. transformal evolution where species are mutating and adapting to environmental changes
2. a species branch out to 2 different species

Question 18

temporal isolation

Answer 18

species breed at diff times of year

Question 19

gametic isolation

Answer 19

female don’t like some male sperm lmfao

Question 20

homologous

Answer 20

species have similar structures and ancestor, but not function
eg. dog and human muscle

Question 21

analogus

Answer 21

species have similar functions, but no common ancestor and different structure
eg. bird, bat, butterfly

Question 22

darwin observations

Answer 22

population no grow
food and resources are competed for
variation between species
more offspring than can survive
variations are heritable

Question 23

darwin inferences