Explain the process of gametogenesis

Question

Problem:

Question 1: What evolutionary development enabled the deuterostomes to roam the land to return to the water?

1. Development of the centrolecithal egg
2. Development of the isolecithal egg
3. Development of the deuterostome limb
4. Development of the amniote egg
5. A, B, and D are corect

 

Question 2: Assume an organism gives birth to an embryo that has no bone tissue, which of the following primary germ layers could be associated with the developmental defect?

1. Endoderm
2. Primordial germ layer
3. Ectoderm
4. Endosperm
5. Mesoderm

 

Question 3: Gametogenesis begins:

1. Immediately after birth of the emryo
2. After fertilization
3. Immediately after organogenesis
4. After puberty
5. None of the above.

 

Question 4: In order to minimize the harmful effects of ultraviolet light, most marine organisms haven't evolved pigments that absorb UV-B light known as :

1. Cadherins
2. Mucopolysaccharides
3. Morphogens
4. Glycoprotein
5. Mycosporine -like amino acids.

 

Question 5: In which stage of commitment can the cell fate be reversed?

1. Labile specification
2. Conditional specification
3. Syncytial specification
4. Determination
5. Both A and B are correct

Please provide the right answer.