Topic 4 questions

Question 1

effect of interbreeding

Answer 1

increases genetic diversity/ gene pool
as new alleles introduced to population

Question 2

allele

Answer 2

alternative/different
form/version/variation
of a gene

Question 3

measuring biodiversity

Answer 3

counting number of different species
counting number of individuals per species

Question 4

number of species increasing

Answer 4

geo iso
different selection pressures
different allele frequencies within separate populations
evolution leading to formation of new species

Question 5

number of species decreasing

Answer 5

endangered species’
only one population
vulnerable to inbreeding depression
risk of natural disaster/disease/predation
may become extinct

Question 6

building site factors assessed

Answer 6

species richness
biodiversity using diversity index
genetic diversity
presence of rare species

Question 7

speciation from common ancestor

Answer 7

mutation leads to variation
favourable allele- survive to reproduce
gives rise to two populations with different allele frequency
two populations reproductively isolated due to natural selection