Developmental Biology

Q: The portion of tha blastoderm-stage embryo which will give rise to most ectodermal, mesodermal, and endodermal tisssues is called the :

(a) :  ventral
(b) :  germ band
(c) :  imaginal discs
(d) :  amnioserosa
(e) :  None of the Above
Answer:  germ band
Explanation:  

Q: The experiments of Spemann and Mangold first defined what feature of amphabian embtoys?

(a) :  the zygote
(b) :  the blastopore
(c) :  the neural tube
(d) :  the organizer
(e) :  None of the Above
Answer:  the organizer
Explanation:  

Q: The development of the antero-posterior axis of Drosophilia is initiated when:

(a) :  the mother packages bicoid and naonos mRNA into the developing oocyte.
(b) :  the Toll receptor is activated after fertilization, leading to nuclear to nuclear localization of Dorsal protein.
(c) :  the terminal group protein Torso sets up the anterior and posterior poles of the embryo.
(d) :  the hameotic genes specify the fate of individual segments.
(e) :  None of the Above
Answer:  the mother packages bicoid and naonos mRNA into the developing oocyte.
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:  

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