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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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lglick01 lglick01
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12 years ago
Can you answer these?

1. What features of devlopment indicate that echinoderms and chordates are more closly related to each other than they are to other animals?

Through the process of gastrulation, a blastula is tranformed into a multilayered
a. blastocoel
b. zygote
c. embryo
d. archenteron

3.The central cavity of a blastula is called a. . . . .
4. The egges of different animal species vary greatly in size, depending on. . . .  .
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wrote...
#1
12 years ago
1. Because they are deuterostomes and their embryos have radial cleavage, their anus forms near the blastopore, and their mesoderm arises from outpockets of endoderm.

2. c

3. blastocoel

4. the size of the animal, number of eggs produced at one time, and the life cycle of the animal.
wrote...
#2
12 years ago
1.Enterocoelomate condition. In other words, the coelom and the enteron(gut cavity, gastrocoel) is common. Mesoderm arises from the outpushing of the endoderm.
2. Embryo
3. Blastocoel
4. The size of the eggs depends upon the amount of yolk(deutoplasm) in the cytoplasm of the egg, accordingly eggs are called micorlecithal, telolecithal, megalecithal etc.
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