Drosophila body plan
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What are the 3 classes of maternal genes that specify the A-P axis?
Bicoid Nanos Torso
Why would an embryo lack anterior regons?
The mother lacked the bicoid gene
Which protein activates anterior expression of hunchback?
Bicoid protein
3 examples of gap genes
Hunchback Giant Kruppel
What do pair-rule genes do? and how are they expressed?
They establish the parasegments They are expressed in 7 transverse striped (every 2nd parasegment)- positions determined by gap genes
3 examples of pair rule genes
Fushi tarazu Odd paired Even skipped
2 differences between gap, pair rule genes and segment polarity genes genes
Segment polarity genes act in a cellular environment rather than a syncytial environment Segment polarity genes encode proteins, their receptors, signalling components and T.factors- the other 2 only encode T.factors
What do segmental polarity genes do?
They fix the parasegment boundaries
3 examples of segmentation genes
Engrailed Wingless Hedgehog
Hh maintains the expression of…
Wg
Wg expression represses what?
Denticle formation