Dossier Questions Flashcards
1
Q
how does evolution occur through natural selection? (3)
A
- through genetic variation or mutaitons
- some organisms are better adapted to survive and reproduce
- therefore their genes are passed on
2
Q
state why two populations (australia and america) may have different frequencies of a certain allele? (3)
A
- this could be due to the founder effect
- or population bottlenecks
- or due to the result of chance
3
Q
by how much must you multiply cm to get pm?
A
by 10 000
4
Q
why is using an index of diversity better than counting the number of species?
A
because population sizes may vary
5
Q
why are seeds often stored in glass containers? (5)
A
- because germination is high in metal containers
- glass containers have similar properties to metal containers
- because glass containers keep the moisture out
- therefore the seed water content is kept below 8%
- you can also see through the glas without removing the lid
6
Q
problems zoos might experience in developing a breeding programme? (5)
A
- small population
- with a small gene pool
- and a low genetic diversity
- could be problems with interbreeding
- difficulties in breeding because some may be too old or sick
7
Q
what are reasons for a breeding programme beng started? (6)
A
- population in the wild was decreasing
- loss of habitat
- breeding programme will increase numbers
- idea that it would enable reintroduction to the wild
- if they are endemic to one specific area
- to conserve the species, if they may face extinction
8
Q
how does genetic variation occur within a population? (3)
A
- crossing over of chromatids
- random assortment of chromosomes
- mutations
9
Q
what brings about adaptation in a population? (4)
A
- selection pressures
- mutations
- an advantageous allele
- idea that individuals with advantageous alleles survive and reproduce
10
Q
suggest how natural selection give rise to adaptations in population? (5)
A
- selection pressures
- competition
- mutation
- advantageous allele
- individuals with advantageous allele survive and breed
