1- Segments in the drosophila embryo
Answer: correspond to anatomical features

2- Not true about GAP genes
Answer: include genes like eve and ftz

3- GAP gene expressed in the later segments (lower torax and abdomen)
Answer: Kruppel

4- Not true about segment polarity genes
Answer: include even-skipped

5- Not a segmentation gene
Answer: ddp

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Answers:

1- Early in the third week, the endodermal sheet constitutes the
Answer: roof of the yolk sack

2- Delination of the yolk sac and gut beguins with the
Answer: ventral bending of the cranial and caudal ends of the embryo

3- As deliniation of the gut proceeds, the anterior end of the foregut remains temporarily sealed by
Answer: the oropharyngeal membrane

4- As the gut becomes increasingly tubular
Answer: the digestive track epithelium and surrounding mesenchyme induce each other

5- Temporarily separates the ectodermaly-derived mouth from the endodermally derived pharinx
Answer: oropharyngeal membrane