After gastrulation, the mesodermal cells contribute to the developing [A] brain

Question

After gastrulation, the mesodermal cells contribute to the developing [A] brain and nervous system. [B] skeletal system and muscles. [C] inner lining of the gut and respiratory tract. [D] sweat glands. [E] liver and pancreas. Body segmentation in Drosophila is controlled by which sequence of gene action [A] Segment polarity, pair rule, gap [B] Gap, pair true, segment polarity [C] Gap, pair rule, segment polarity [D] Bithorax, pair rule, segment polarity [E] None of the above The cells that form the neural tube come from the [A] notochord. [B] mesoderm. [B] endoderm. [D] ectoderm. [E] neuroderm. Female Drosophila that are homozygous for the bicoid maternal effect gene mutation produce larvae with no head or thorax. When cytoplasm from the anterior end of a wild- type egg is inoculated into the anterior end of a bicoid mutant egg, the treated egg develops normally. The normal development in the mutant eggs is cause by [A] disruption of mutant bicoid gene expression after their inoculation with wild-type egg cytoplasm. [B] normal bicoid gene expression. [C] expression of the nanos gene. [D] induction of normal development by adjacent embryo cells. [E] the inoculation of normal egg cytoplasm. If an organism is missing the outer layer of skin upon birth, which of the following might cause it? [A] loss of mesoderm [B] loss of ectoderm [C] loss of endoderm [D] [E] Which of the following statements is true [A] Biologists can observe determination via microscopic studies. [B] Differentiation is usually followed by determination. [C] Differentiation consists of the actual biochemical, structural, and functional changes of a cell. [D] All of the above [E] None of the above

Explanation / Answer

17. Answer is B. Ectoderm loss

15. Answer is D. Ectoderm

14. Answer is B. The order is GAP GENES----->PAIR RULE GENES---------->SEGMENT POLARITY GENES

13. Answer is B. Skelital system & Muscle system

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