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Flashcards in urbilateria Deck (22):
1

urbilateria

main ancestor of bilateria animalshox

share characteristics with deuterostomes and protosomes

2

embryo patterning

uses hox genes and chordin

are homolous; some evolution potential lost

3

homologoy

similariies due to common descent and inheriance

4

analogy

indepdenet/convergent evolution of traits in unrelated organisms

5

legs; homolougs or analogos

monophyletic group; homolougous

6

example of homologies through similarities

pentadactyle limbs of whale, bats and humans

libs have same function even though look different

7

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

8

what are hox genes

ubx segements in flies that tells its how to develop

9

eyes and analogy

used to be thought to be homologous but actualyl analogous due to selective power

10

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)

11

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

12

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

13

hox genes and urbilateria

determine anterior and posterior patterning
8 hox genes

14

hox4 gene

hox4 gene in mouse and drophoila homoloug cause deformations

15

what gene causes eyes to develop

pax6 gene common in all urbilateria descendants

16

introversion of dorsoventral axis

'upside down' chordates gene expression compared to invertabrate

17

what does chordin and sog do

CNS present in urbaliteria;
urbliaterian genes pattern nerve cords

18

examples of enigmatic taxa

mezosoans
xenoturbella
buddenbrockia
saliennla sale

19

mezosoans

consist of dicemida and orthonecid
termatodoe flatworm

20

buddenbrockia

relative of cnidaria maybe

21

mitochondria nad5 gene

signature of prostomes

22

examples of reassembled phlyum due to mitochondrial genes

intoshia and dicymia