Which Group is Incorrect

Question

Which group is incorrect?
A) Extraembryonic membranes: graafian follicle, chorion, yolk sac
B) Twinning: monozygotic, dizygotic
C) Primary germ layers: ectoderm, mesoderm, endoderm
D) Genes: dominant, recessive, codominant

Accepted Answer

Graafian follicle is not an extraembryonic membrane, it is a structure in the ovary. The other three (chorion, yolk sac, and amnion) are extraembryonic membranes.