Presentation is loading. Please wait.

Presentation is loading. Please wait.

Classification Of Eggs Based Upon Amount Of Yolk Egg TypeRepresentative Organisms a) Alecithal - Almost without yolk.Placental mammals b) Microlecithal.

Similar presentations


Presentation on theme: "Classification Of Eggs Based Upon Amount Of Yolk Egg TypeRepresentative Organisms a) Alecithal - Almost without yolk.Placental mammals b) Microlecithal."— Presentation transcript:

1 Classification Of Eggs Based Upon Amount Of Yolk Egg TypeRepresentative Organisms a) Alecithal - Almost without yolk.Placental mammals b) Microlecithal - Small amount of yolk. Echinoderms, amphioxus, marsupials c) Mesolecithal - Moderate amount of yolk.Lung-fishes, frogs, and toads. d) Macrolecithal - Very large amounts of yolk.Sharks, bony fishes, reptiles, birds, insects.

2 Classification Of Eggs Based Upon Distribution Of Yolk a.)Isolecithal or Homolecithal - Yolk is evenly distributed. Occurs in the alecithal and microlecithal eggs of echinoderms, amphioxus, marsupials, and other mammals. b) Telotecithal - Yolk is concentrated on one end of the egg, the vegetal hemi-sphere, with the cytoplasm plus the nucleus concentrated the at other end, the animal hemisphere. Occurs in the mesolecithal and macrolecithal eggs of frogs, toads, birds, reptiles etc. c.) Centrolecithal - Yolk is in the center of the egg, with cytoplasm around it. Example: Insect eggs

3 Endolecithal and Ectolecithal Eggs


Download ppt "Classification Of Eggs Based Upon Amount Of Yolk Egg TypeRepresentative Organisms a) Alecithal - Almost without yolk.Placental mammals b) Microlecithal."

Similar presentations


Ads by Google