| 1 | Having the yolk unevenly distributed throughout the egg. | |
| 2 | Adding yolk to a little egg was a recipe for a female. | |
| 3 | The difference in the nutritive values of pidan egg yolk and duck egg yolk was significant. | |
| 4 | The gonads form from a group of large granulated yolk sac cells which invacle the germinal ridges. | |
| 5 | Until about three months in the womb, baby sharks feed off a yolk sac. |