variations on ancestral themes reading Flashcards
prostomes
examples
nematodes arthopods and oncyohophorans
flatworms annelids and molsucs
deuterstomes
examples
hemichordates
echinoderms
chordates
urbilateria
common ancestor to bilateria
genes lost by individual phyla in evolution
evodevo
evolution and developmental viology balidates thro gene analsis to determine classification
drosophila and xenopos
have same hox genes that control antero posterior axis
have chordin bmp gene networks that determines dorsal ventral development
prostomes vs deutersomtes
prostomes; mouth at blastophore, mouth first, ventral nerve cord
deutersomes; mouth second, anus at blastopore, dorsal nerve cord
prostomes subspecies
ecydozoa and lophotrochozoa
ecdysozoa
arthopods nematodes oncyhophorans
lophotrochozoa
flatwoms anneilids chordates molluscs
snowball earth scneario
glaciation period 550 mya that decreased biological activity and cause selecte bottlenecks, after which radiation of metazoa occured
animals evolution
biologically geographically isolated
evolution through genetic evolution
after snowball earth; environment warmed up and intense disepred evolution and gene loss
genetic tool kit
urbilateria as common ancestor to bilateria
ep lewis
diveored genes control fly ambomdinal segements through colinearity (anterior posterir axis expression)
lost genes of urbilateria examples
c elegans and drosohpila lose genes in lophotrochozoa and chordates
nematostella vecetensis
sea anmon; cnidarian believed to have diverged from bilateria