urbilateria Flashcards
urbilateria
main ancestor of bilateria animalshox
share characteristics with deuterostomes and protosomes
embryo patterning
uses hox genes and chordin
are homolous; some evolution potential lost
homologoy
similariies due to common descent and inheriance
analogy
indepdenet/convergent evolution of traits in unrelated organisms
legs; homolougs or analogos
monophyletic group; homolougous
example of homologies through similarities
pentadactyle limbs of whale, bats and humans
libs have same function even though look different
homology of genes
genetically easier to dertermine
use statistical measures; such as 2 genes can be calculated to be homologus; genes in both mouse and fly for example
what are hox genes
ubx segements in flies that tells its how to develop
eyes and analogy
used to be thought to be homologous but actualyl analogous due to selective power
what do vertebrates and flies have in common
same mutations affect developmen t of eyes;
‘eyeless mutations in eyeless flies’ or ‘annidinia in humans’
all mutations from homologous genes (pax6 gene)
drosphila and mous
small eye mouse and drosphoila eyeless gene both have th ehomologuos pax 6 gene mutation
can be inserted into each others species to cause such developments
hox genes and flies
8 related hox genes in flies determien the specific positiosn of body on a flay front to back; same gene found in other animal groups
hox genes and urbilateria
determine anterior and posterior patterning
8 hox genes
hox4 gene
hox4 gene in mouse and drophoila homoloug cause deformations
what gene causes eyes to develop
pax6 gene common in all urbilateria descendants