3.1 Flashcards
how DNA sample produced from small sample of DNA
-multiple copies of DNA molecule made
-using PCR
-restriction endonuclease for fragments
-gel electrophoresis
-loading DNA onto agar gel
-electric current applied
-use of UV light/ radioactive labelling
how DNA samples are compared
-compare position of bands
-compare total number of bands
-compare size/width of bands
how organisms can be classified into taxonomic groups
-organisms with shared features placed ina group
-observable shared features
-molecular phylogeny/ behavioral features/
how woese ideas were critically evaluated
-peer review
-scientific findings published in papers
-scientific ideas shared at conferences
explain woese when he said organisms can be placed in taxonomic groups based on molecular phylogeny
-organisms with shared traits placed in one group
-taxonomic groups have specific differences
-phylogeny describes genetic relationship
-molecular phylogeny based on similarities in DNA
why success of interbreeding might cause scientists to class species as same
-success interbreeding produced offspring
-sane species produce fertile offspring
-genetic incompatibility causes offspring of different species to be infertile
why different species dont interbreed
-reproductive isolation
-different breeding times
-dont recognise courtship displays
-physically incompatible
why rate of change between 2 species slow
-2 species share same habitat
-2 species experience same enviormental conditions/ same selection pressures
-both well adapted to enviorment
-no mutations to change phenotype
genetic diversity
-variety of alleles
-in gene pool
how 2 different species might have evolved from single ancestral species
-population increasing in size more habitats
-mutations
-diversity in flowering times
-reproductive isolation
-restriction in gene flow
-different enviorment= different selection pressures
-change in allele frequencies
-change in gene pool
