Developmental Biology

Q: The portion of the Drosophila body plan which will produce the wing is called:

(a) :  telson
(b) :  dorsal
(c) :  abdomen
(d) :  thorax
(e) :  None of the Above
Answer:  thorax
Explanation:  

Q: The activation of zygotic hunchback expression by Biciod protein illustrates what principle in the establishment of positionl information in embroys?

(a) :  The mother can influence development through the packaging of materials into the egg.
(b) :  The gradient of a protein can activate a gene in a descrete region of a embryo through a threshold effect.
(c) :  The identity of segments in the embyo is a reflection of their position in the embryo.
(d) :  A cascade of gene activations occur in the syncitial blastoderm.
(e) :  None of the Above
Answer:  A cascade of gene activations occur in the syncitial blastoderm.
Explanation:  

Q: A gap gene mutation might cause which of the following defects in the embroynic body plan?

(a) :  Every other segmentwould be missing, resulting in T1,T3,A2,A4, et (C.) but no T2, A1, A3 and so on.
(b) :  Segments A2 through A6 would be missing, but the rest of the pattern is esentially normal.
(c) :  No segmentatiion would be evident.
(d) :  Pattering with in each segment would be abnormal, causing for example denticle belts to form across the entire segment.
(e) :  None of the Above
Answer:  Segments A2 through A6 would be missing, but the rest of the pattern is esentially normal.
Explanation:  

Q: The adult body plan of the fly is based on reiterating structures called segments; segmant presursors (perasegments) are first positioned at the cell-by-cell level by which group of genes?

(a) :  maternal genes such as biciod
(b) :  gap genes such as kruppel
(c) :  pair-rule genes such as even-skipped
(d) :  Segmentation genes such as cngrailed
(e) :  None of the Above
Answer:  pair-rule genes such as even-skipped
Explanation:  

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