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DB Chapter 11: Early development in drosophila melanogaster
What are the difficulties in studying drosophila melanogaster?
Embryos are relatively complex, small and intransparent
DB Chapter 11: Early development in drosophila melanogaster
What is a "chorion"? What is a "micropyle"?
Chorion is a shell than surrounds the egg. Micropyle is the small opening of it, that allows passage of one sperm at a time.
DB Chapter 11: Early development in drosophila melanogaster
How long is the sperm's tail of drosophila? What is the function?
extremely long, about 1,8 mm. It prevents other sperms from passing through the micropyle (polyspermy block).
DB Chapter 11: Early development in drosophila melanogaster
The egg begins to organise its axes, _________
before the sperm enters.
DB Chapter 11: Early development in drosophila melanogaster
What type of cleavage is common for drosphila embryos?
Meroblastic superficial cleavage.
DB Chapter 11: Early development in drosophila melanogaster
When does the expression of zygotic genes begin? When are they greatly enhanced?
The expression of zygotic genes begins around cycle 11 and is greatly enhanced when cells are formed at cycle 14.
DB Chapter 11: Early development in drosophila melanogaster
Why does the nuclear division slow down at cycle 14?
Because of the appearance of gap phases in the cell cycle.
DB Chapter 11: Early development in drosophila melanogaster
After circle 14, which RNAs are degraded and which genome takes over the control of development?
Maternal RNA is degraded and the zygotic genome takes over control of development.
DB Chapter 11: Early development in drosophila melanogaster
How is the transition from maternal RNA development control to zygotic genome development control regulated?
By the ratio of chromatin to cytoplasm
DB Chapter 11: Early development in drosophila melanogaster
When does gastrulation start?
Soon after mid-blastula transition.
DB Chapter 11: Early development in drosophila melanogaster
What is an acron?
Terminal portion of the head
DB Chapter 11: Early development in drosophila melanogaster
What is telson?
Tail
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