Manipulating the embryo to get segmentation pattern

Reference no: EM1384094

(1) If all three Bithorax complex genes are deleted, how would you expect the segments of the larva to develop? The segments are written in anterior to posterior order.

A. T1 T2 T3 A1 A2 A3 A4 A4 A4 A4 A4

B. T1 T2 T3 A1 A1 A1 A1 A1 A1 A1 A1

C. T1 T2 T3 T3 T3 T3 T3 T3 T3 T3 T3

D. T1 T2 T2 T2 T2 T2 T2 T2 T2 T2 T2

(2) If Ultrabithorax is added back to the embryo (but abdA and abdB are still gone), how would you expect the segments of the larva to develop? The segments are written in anterior to posterior order.

A. T1 T2 T3 A1 A2 A3 A4 A4 A4 A4 A4

B. T1 T2 T3 A1 A1 A1 A1 A1 A1 A1 A1

C. T1 T2 T3 T3 T3 T3 T3 T3 T3 T3 T3

D. T1 T2 T2 T2 T2 T2 T2 T2 T2 T2 T2

(3) How would you have to manipulate the embryo to get the segmentation pattern represented here?

--- T1 T2 T3 A1 A2 A3 A4 A4 A4 A4 A4

A. Delete the antennapedia gene

B. Delete the ultrabithorax gene

C. Delete the abdominal A gene

D. Delete the abdominal B gene

(4) Which of the following is considered a morphogen when the Drosophila embryo is considered a cellular blastoderm?

A. Hunchback

B. Wnt

C. Hedgehog

D. A and B

E. A and C

F. B and C

G. None of the above

(5) Wingless expression occurs at the ( ) side of a segment and the ( ) side of a parasegment.

A. Posterior, posterior

B. Anterior, anterior

C. Posterior, anterior

D. Anterior, posterior

(6) Gap genes ( ) the expression of pair-rule genes.

A. Activate

B. Repress

C. Both activate and repress

D. Neither activates nor repress

(7) The boundaries of the seven stripes produced by pair-rule genes are defined by the activity of:

A. Maternal effect genes

B. Gap genes

C. Pair-rule genes

D. Hox genes

(8) Cells in the parasegments of the drosphila embryo are thought to be specified by:

A. The interaction between maternal effect genes and gap genes

B. The boundaries of overlap of gap genes

C. The signaling center created by segment polarity genes

D. The regulation of Hox genes.

Reference no: EM1384094

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