module 4 (2) Flashcards
(14 cards)
how does speciation occur
populations are reproductively isolated
changes in allele frequencies
changes in phenotypes
development of new species
what does a homeobox code for
TF (homeodomain)
which binds to DNA at start of dev. genes to activate or inactivate transcription
what is genetic drift based on
chance
what is genetic drift present in
small populations
genetic bottleneck
founder effect
when do we use hardy-weinberg principle
large population
no mutations
no natural selection
random mating
what are rhizomes
grow horizontally underground with nodes
what are runners
grow overground with nodes
what are suckers
shoots grown from sucker buds
what are tubers
act as underground food sieve
has ‘eye’ which sprout
what are bulbs
also food sieve
but has bulbs which form new plants
what are the features of horticulture
cutting
layering
grafting
how do we take a cutting
scalpel cut from end of stem
remove leaves from lower end
dip in rooting powder
plant in pot containing growth medium
provide cutting w/ moist + warm environment
how do we use tissue culture
cells taken
sterilise
place in culture medium
when it’s grown to small plant, transfer to soil
define micropropagation
propagation by growing plants in tissue culture and planting them out
