Teleost eggs are telolecithal, with the yolk segregated from the active cytoplasm. |
|
Mammals have very little yolk but have evolved from reptiles with telolecithal eggs and, thus, they retain features to cope with the problem of a large inert yolk mass. |
|
The cytoplasm of the unfertilized telolecithal egg surrounds yolk vesicles. |
|