Which of the following is not a unique feature of

Which of the following is NOT a
unique feature of Drosophila
fertilization?
A)
The sperm can be much longer in length than the
adult male body
B)
The anterior-posterior and dorsal-ventral axes are
determined prior to fertilization
C)
After mating, the female may store the sperm in the
spermatheca for weeks before using it for fertilization
D)
A yellow pigment makes the cells that will become muscle
visible and trackable during development
E)
The egg leaves the ovary with nurse cells (germline)
and follicle cells (somatic)
Grant
sperm
f
Tumates
I

The drosophila egg chamber:
Ables, Genetics 2015
Image credits: .
The initial axes determination is reliant on a factor translated from mRNA clustered at the
oocyte nucleus. What is this factor?
The anterior-posterior and dorsal-ventral axes are set before the sperm even enters"
Gurken

Ables, Genetics 2015
Image credits: .
Which of the following is FALSE about the drosophila oocyte?

Patterning
Drosophila
Gradients of
morphogenetic
maternal factors
Activate transcription of
gap genes, define broad
regions
Gap genes enable expression
of pair-rule genes, which are
expressed in
parasegment
regions
Segment polarity
genes define each
individual segments
Homeotic selector
genes define the
identities of each
segment
Which genes are expressed from the zygotic genome?
What are these
maternal factors?
I
large
region
of
embryo
organ
Whm
I
affected
losing
get
segments
w
ea
segment
responsible
1
more
d
change
identity
of
embryo

Regulation of both translation
and
transcription
:
Maternal factors regulate gap genes in a concentration-dependent
manner
Bicoid
Hunchback
Nanos
Caudal
Head and
thorax
genes
Genes for
abdominal
development
BEFORE fertilization:
-
Gurken / follicle cell signaling loop
at
posterior
sets the A-P axis through effects on PAR proteins
- Bicoid mRNA is transported along microtubules
to the anterior
- Oskar mRNA is transported to the
posterior
where Oskar protein protects
Nanos mRNA from
degradation
- Gurken/follicle cell signaling loop then moves
dorsal
for D-V axis
y
byo
poms
SH
g
anterior
fates
cubdurin
genes
mm
postner
Meypurmm
thnx
Oskar
supp
hmmm
trans
suppuration