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: Which of the following would lead to a dorsalized embryo? (Recall that genes in Drosophila are named for their mutant phenotype.)

(a) :  dorsal mutanat
(b) :  cactus mutant
(c) :  toll mutant
(d) :  spatzle mutant
(e) :  None of the Above
Answer:  dorsal mutanat
Explanation:  

Q: Mutations in homeotic genes can lead to what type of developmental defect?

(a) :  The anterior portion of the embryo does not develop.
(b) :  Several adjacent segments will be missing from an otherwise intact embryo.
(c) :  The embryo will develop with every other segment failing to form
(d) :  The development of segments will be changed wholesale from their normal identity to that of a different segment.
(e) :  None of the Above
Answer:  The development of segments will be changed wholesale from their normal identity to that of a different segment.
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:  

Register now to view all Question's

Sign in OR Sign Up


Back to top