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Chorion

Chorion

1. Protective membrane around the eggs of insects and fishes.

2. Extraembryonic membrane surrounding the embryo of amniote vertebrates. The outer epithelial layer of the chorion is derived from the tropoblast.


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Unidirectional ORI, Onion-Skin-Model

... your statement: "The paper also says that the ORI lies in the middle of the gene" since it says that "replication origin near the chorion genes"...

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by Cat
Sun Sep 09, 2012 2:13 pm
 
Forum: Genetics
Topic: Unidirectional ORI, Onion-Skin-Model
Replies: 4
Views: 6442

Re: Unidirectional ORI, Onion-Skin-Model

... genes of Drosophila can be amplified without extra chromosomal replication. A large number of follicle cells surround the egg and produce the chorion. The genes encoding the chorionic proteins exist in two clusters (one on the X chromosome and one on an autosome). Only a single copy of each ...

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by Rost
Thu Aug 30, 2012 6:52 am
 
Forum: Genetics
Topic: Unidirectional ORI, Onion-Skin-Model
Replies: 4
Views: 6442

Unidirectional ORI, Onion-Skin-Model

Hi there! I have a question regarding to the onion skin model in Drosophila melanogaster . I understand why D. melanogaster amplificates its chorion genes etc. I always read that the onion skin model uses an unidirectional ORI. My question: the ORI in the illustrations which i've looked at is ...

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by Rost
Wed Aug 29, 2012 1:38 pm
 
Forum: Genetics
Topic: Unidirectional ORI, Onion-Skin-Model
Replies: 4
Views: 6442

Re: HCG Diet - Excellent Idea Or Not necessarily?

... it really means when anyone makes a selective choice about what they consume. The HCG treatment involves the injection of a hormone called human chorionic gonadotropin. The idea of injecting this hormone came from the birth control where women are given an artificial does of human hormones to ...

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by daniel.kurz
Sun Oct 30, 2011 2:52 am
 
Forum: Human Biology
Topic: HCG Diet - Excellent Idea Or Not necessarily?
Replies: 4
Views: 3872

Extraembryonic Membranes

does anyone know exactly how the four membranes amnion yolk sac chorion, and allantois work to protect the embryo and egg?

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by vlc1500
Wed Mar 07, 2007 1:32 am
 
Forum: Zoology Discussion
Topic: Extraembryonic Membranes
Replies: 6
Views: 9253
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