Transcript Oct. 23rd

Th
10/2
Ch. 2
Molecular development of Drosophila
T
10/7
More molecular development of Drosophila
Th
10/9
Ch. 7
Plant development
On Thursday, 10/9, Please bring a copy of the primary research article you have selected
(or more than one if you haven’t decided) plus your notes on the article.
T
Th
T
Th
T
Th
T
Th
10/14
no class – October Vacation
10/16
More plant development
10/21
Ch. 8
Mechanisms of morphogenesis
10/23
More morphogenesis
10/28
Ch. 10
Cell differentiation
10/30 Happy Halloween Eve!
Stem cells
11/4
Ch. 11
Organogenesis
11/6
More Organogenesis
11/10
NO CLASS Veteran’s Day
T
11/11
EXAM 2 Chapters 2, 6, 8, 10
Th
11/13
Ch. 12
Development of the nervous system
T
11/18
More neural development
Your review paper is due at the beginning of class on Tuesday, 11/18
From our course web site: “Assignments Explained”
two short writing assignments:
Each worth 20 points. At any point during the semester, pick any
topic in developmental biology from class, text, web, TV, or
anywhere and learn more about it. Keep track of all the sources
you use (Wikipedia etc.) to learn more and then write a two page
paper along with a bibliography of all your sources and hand it.
Write two papers like this during the semester. The purpose is to
encourage you to track down more knowledge when you find
something interesting. A key challenge in your papers is to
explain how each topic is actually a topic in the field of
developmental biology and not a different area of biology.
Chapter #2
not in text
Genes to focus on during Drosophila embryogenesis
Bicoid
Hunchback
Even-skipped
Engrailed
Antennapedia
Hedgehog
Wingless
Gurken
Toll
Dorsal
Decapentaplegic
Short gastrulation
not in text:
egg chamber
2.8 fly A/P axis
gene hierarchy
Look at the summary paragraphs and associated flow charts
throughout Chapter 2:
p. 66
Summary: Early Expression of Zygotic Genes
2.39 Hh/Wg
4 nuclei
2.41 Hh/Wg
feedback loop
Box 1E Wnt signal transduction
2.40 Hh signaling pathway
2.37 clones
in wing
2.21 D/V slice
Comparing animals and plants:
Invented multicellularity independently
Some differences:
No germ line cells in plants
(plants are easy to clone.
No maternal factors???)
No morphogenesis in plants
(very simple fate maps)
Plant cells contain plasmodesmata
(a type of gap junction between cells)
Comparing animals and plants:
Invented multicellularity independently
Some differences:
No germ line cells in plants
(plants are easy to clone.
No maternal factors???)
No morphogenesis in plants
(very simple fate maps)
Plant cells contain plasmodesmata
(a type of gap junction between cells)
7.4 fate map
7.22 root fates
Comparing animals and plants:
Invented multicellularity independently
Some differences:
No germ line cells in plants
(plants are easy to clone. No maternal factors???)
No morphogenesis in plants
(very simple fate maps)
Plant cells contain plasmodesmata
(a type of gap junction between cells)
Fig. 1.23
Fig. 6.35
FT mRNA is transcribed in leaves and then the mRNA
goes through plasmodesmata on the way to cells in the
shoot meristem where it is translated into a transcription
factor protein that regulates transcription of genes for
flowering.
Fig. 1.23
Comparing animals and plants:
Invented multicellularity independently
Some similarities:
Totipotency
(each cell retains the entire genome)
Stem cells (called initials in plants)
Stem cell niches (called meristems in plants)
Homeotic genes
(but the genes are different in plants vs animals)
7.10 stem/leaf pattern
Animal terms = totipotent, pluripotent
Plant term = indeterminant