Hox genes Flashcards
What is the evidence for burst of evolution?
The fossil record
Can rapid evolution be man-made?
Yes
Give an example of man-made rapid evolution
The domestication of maize from teosinte
What did the domestication of maize from teosinte select for?
Ear and plant morphology
What has genetic analyses revealed about the selection during the domestication of maize from teosinte?
Selection acted upon regulatory elements of the tb1 gene
The body plans of several animal phyla consist of serially repeated structures. Give examples of phyla
Annelids
Arthropods
Chordates
How was the last common ancestor of the three major bilateral groups (deuterostomes, lophotrochozoans, ecdysozoans) achieved?
With diversification of Hox genes
What does the hox gene cluster determine?
Segmental body plan
Are hox genes conserved?
Yes, highly conserved
Is colinearity of hox genes obligatory?
Not in flies
Colinearity in flies is ancestral, but not functional as in mammals
What organisms is the QAQApolyAlanine stretch in the Ubx gene found in?
Only in higher insects
How many limbs do hexapods have on their trunks?
3 pairs
How many limbs do crustacea have on their trunks?
Multiple
What does overexpression of hsp-PhUbx lead to?
A to P transformations
What does Ubx expression lead to?
Appendage specialisation
