pleas pleas do all parts 1-Are both the egg and zygote of a sea star the same si

Question

pleas pleas do all parts

1-Are both the egg and zygote of a sea star the same size?

2-Do the cells of a two-cell sea star embryo differ in size?

3-Does the sea star embryo appear to be growing during cleavage?

4-What structures will the archenteron develop into?

5-What obvious visual change occurs in a frog egg upon fertilization?

6-How is the orientation of the blastocoel in an amphibian blastula different than that of a sea star?

7-What structures will form from the neural fold of the frog embryo?

8-In a chick embryo at gastrulation, what does the primitive streak indicate?

9-What are the segmented units that are visible along the dorsal axis of the 33 hour chick embryo?

10-The basic stages of development are quite similar for a wide range of organisms. How would you explain such consistency?

Explanation / Answer

1Ans. Yes, both the egg and zygote of a sea star the same size.

2.Ans. Yes, the cells of a two-cell sea star embryo differ in size i.e smaller in size because resulted from mitosis division of zygote.

3 Ans. No, the sea star embryo appear to be growing during cleavage

4. The archenteron develops into endoderm and mesoderm of an animal. It is the primary gut forms in the zygote during gastrulation.

6. The orientation of the blastocoel in an amphibian is not in the center but located in the animal pole and in the case of sea star it is in the center.

7. Neural folds fuse to form the neural tube that gives rise to brain and spinal cord.

9 Ans. 'Somite' are the segmented units that are visible along the dorsal axis of the 33-hour chick embryo.

8. The primitive streak indicates the start of gastrulation(inner mass is converted into ectoderm, endoderm and mesoderm.

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