Embryos of chickens (*Gallus gallus domesticus*) are often used in genetic experimentation and testing. To a lesser extent, adult chickens can be used as a laboratory animal.

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What are differences between formation of embryonic disc in chick and mammal embryo?

Exam question which got lowest average points in my university: 1/5 average. No markscheme available so my attempt below. I assume that embryonic disk prefers to germ disk such that Formation prefers ...