Explain why all animals use the same cell adhesion molecules

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Reference no: EM133423411

Questions:

a. Explain why all animals use the same cell adhesion molecules and receptors. List them and explain the lines of evidence researchers use to validate their claims.

b. All animals are also linked by a gastrula stage during development. Explain how the gastrula evolved from a simple ball of cells. How are Hox genes and germ layers involved?

c. Protostomes and Deuterostomes appeared almost simultaneously in the fossil record. This led evolutionary biologists to conclude modern lineages originated during the Cambrian explosion. What recent findings now refute this claim? When did these lineages actually originate?

d. Embryogenesis evolved soon after gastrulation. Use the difference between protostome and deuterostome gastrulation to explain how Type I and Type II embryogenesis could have evolved

Reference no: EM133423411

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