Chorion in a sentence as a noun

They literally have cells with Y chromosomes in their bodies, received from the male twin through the shared chorion.

Some zebrafish will only glow red when you feed them special stuff, some glow green, some only glow green in certain parts of their yolks/chorion.

Chorion definitions

noun

the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)