module 6: variation

Question 1

continuos

Answer 1

individuals in a population vary within a range- mono distinct categories
height

Question 2

discontinuous

Answer 2

two or more distinct categories and individuals fall into one
blood group

Question 3

epistasis

Answer 3

the allele of one gene masks the expression of the alleles on other genes

Question 4

what is evolution

Answer 4

the change in allele frequency in a population over time

Question 5

natural selection

Answer 5

individuals in a population vary because they have different alleles
predation, disease, competition create struggle for survival
some better adapted bio pressures
those with advantageous alleles survive, reproduce, pass on allele
more of next generation inherit advantageous allele

Question 6

genetic drift

Answer 6

chance determines passing on alleles, certain alleles passed on more than others

Question 7

genetic bottleneck

Answer 7

event that causes big reduction in population size do reduced gene pool

Question 8

founder effect

Answer 8

when a few organisms in a population start a new population with small number of alleles

Question 9

artificial selection

Answer 9

humans select desirable traits to breed

Question 10

speciation

Answer 10

development of a new species, populations of same species become reproductively isolated

Question 11

allopatric speciation

Answer 11

geographic isolation with different conditions on each side and natural selection to the environment cause it

Question 12

how does reproductive isolation occur

Answer 12

seasonal change- different flowing or mating seasons
mechanical change- change in genitalia
behavioural change- courtship rituals not attractive

Question 13

sympatric speciation

Answer 13

no geographical isolation, random mutations occur