Ch9 - Homeotic Selector Genes Flashcards Preview

Cell Bio & Developmental Genetics > Ch9 - Homeotic Selector Genes > Flashcards

Flashcards in Ch9 - Homeotic Selector Genes Deck (11):
1

Homeotic selector genes

after segmental boundaries are set, the characteristic structures of each segment are specified by homeotic selector genes

2

2 regions of chromosome 3 have the most homeotic genes

• the Antennapedia complex
• the Bithorax complex

3

The Antennapedia complex

give the identity of the head and thoracic segments

4

The Bithorax complex

give identity to the
• 3rd thoracic segment
• abdominal segments

5

3 thoracic segments

1. legs
2. legs and wings
3. legs and halteres

6

The initial domains of homeotic gene expression is influenced by

gap genes and pair-rule genes

7

All homeotic genes are regulated...

negatively by all the homeotic gene products expressed posterior to it

8

Identities of segments must

be stabilized so differentiation can occur

9

Transcription patterns stabilized...

locked into place by alteration of chromatin

10

Transcription stabilization (chromatin) maintained by

Trithorax proteins

11

Repression of homeotic genes maintained by

Polycomb proteins