BIOL 1030 Lecture Notes - Lecture 7: Zygote, Ovoviviparity, Oviparity

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 1030
• Professor: Kevin G.Scott

Document Summary

Eggs large cells containing yolk: 1 of 4 daughter cells is going to be a functional egg. Protective jelly coat - thickness depends on the animal, protects eggs from drying out and the the vitelline layer - outer line membrane that surrounds the egg, builds after meiosis occurs cell doesn"t die. Micropyle - contained in fish, small hole where sperm moves through cortical granules- inside the cell and is important in fertilization process. Yolk is the fat and protein rich granules within the cytoplasm: nourishment for embryo, giant egg cell, ovum . Nuclear fusion - the fusion of the nucleus and sperm to make the diploid nucleus of zygote (2nd step of fertilization) Asynchrony - is bad, both males and females can do so: pheromones, environmental cues. Direct deposition - sperm gets into the females" internal tract for fertilization: copulatory organ, courting behaviours.