1. What is one big difference between how frogs and fish gastrulate? (1-2 sentences) (Hint -explain...

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Biology

1. What is one big difference between how frogs and fishgastrulate? (1-2 sentences) (Hint -explain how each of theseorganisms gastrulates and the difference will be obvious!)
2. Number the following steps of germ cell development in theappropriate order.
A. The primordial germ cells undergo meiosis.
B. The primordial germ cells are specified
C. The primordial germ cells migrate to where the gonads aredeveloping
3.
What are the signals that are required for the induction of theorganizer?
TGF-beta signaling is the mesoderm inducing signal, Wntsignaling comes from the Niewcoop center
Wnt signaling is the mesoderm inducing signal, TGF-betasignaling comes from the Niewcoop center
Signals come from the animal hemisphere to induce theorganizer
the organizer is autonomously specified
4. How did C. Easley make sperm-like cells from human foreskinfibroblasts? (2-3 sentences)
5. What is special about how the genes (whose mutations resultin the flies above) are arranged in the fly genome and how they areexpressed in the developing embryo? (1-2 sentences)

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ans 1the end product of gastrulation is brastula disk shaped of undifferentiated cells inside embryo consisting of three different layers gastrullation depends on yolk distribution FISH The fish embryo is telolecithal and contains lots of yolk Cleavage results in a flat mass of cells on one side of the embryo Gastrulation follows consisting of two major processes epiboly and involution In epiboly cells at the animal pole termed the blastoderm or blastodisc in fish spread out and See Answer

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		TGF-beta signaling is the mesoderm inducing signal, Wntsignaling comes from the Niewcoop center
		Wnt signaling is the mesoderm inducing signal, TGF-betasignaling comes from the Niewcoop center
		Signals come from the animal hemisphere to induce theorganizer
		the organizer is autonomously specified