Evolutionary Development

Front 1

deBaer's law says animalembryos are more similar to one another earlier in development than they arelater in development, Why?

Back 1

early development is more conserved because earlier changes tend to have bigger effects andbigger effects are more likely to be deleterious.

Front 2

Homeotic genes ("youare here"):

Back 2

transcription factors thatspecify body part identity by saying “you are here”

Front 3

Hox genes:

(hint: their regulatory, colinear genes)

Back 3

a special class of homeoticgenes, say “you are hear along theanterior-posterior axis”

Front 4

Transcription factors:

(hint: homeotic and hox genes are transcription factors)

Back 4

A protein that turns genes on and off

Front 5

Enhancers:

(hint: when Transcription factors binds, transcription takes place)

Back 5

enhancer are a non codingsegment of DNA, where transcriptions factors bind

Front 6

Hox genes are very conserved, if animals evolve how do they do this if hox genes, the signal, doesn't evolve?

Back 6

target genes and enhancers that drive those target genes haveevolved

Front 7

If a hox gene codes for therepression of gene, say it represses antennas in a given region and it is destroyed then theknockout phenotype is

Back 7

antennas in thatregion

Front 8

A trait is homologous if

Back 8

species, both inherited it froma common ancestor

Front 9

T/F It is common that homologous genes arecoding for nonhomologous structures

Back 9

true

Front 10

since hox genes are conserved, phenotypes are regulated by

Back 10

expression levels- when,where, and how much of a given protein during development