Week 5 Flashcards
1
Q
summary
A
- temporal hierarchy of gene expression in segmentation cascade is also a functional hierarchy
- molecular patterning underlying the segmentation of the drosophila embryo is established hierarchically with progressively smaller subdomains of gene expression activated over time
- generation of segments in drosophila is analogous to hierarchical subdivsion of cake as done in class
2
Q
definition of morphogen
A
A morphogen is any substance active in pattern formation whose spatial concentration varies and to which cells respond differently at different threshold concentrations
3
Q
molecular control of development
A
- Patterning mechanisms: morphogen gradients
- From maternal gradients to gap gene expression
- The molecular basis of repeating patterns
