Question
Biology Question on Pregnancy And Embryonic Development
The amnion of mammalian embryo is derived from
A
ectoderm and endoderm
B
ectoderm and mesoderm
C
mesoderm and trophoblast
D
endoderm and mesoderm
Answer
ectoderm and mesoderm
Explanation
Solution
The correct answer is Option B) ectoderm and mesoderm
The developing fetus resides in the amniotic cavity, surrounded by the amnion membrane. The amnion membrane is derived from the extra somatic ectoderm on the inner side and mesoderm on the outer side. The extraembryonic or fetal membranes consist of the amnion, chorion, allantois, and yolk sac.
- The amnion is formed from the mesoderm on the outer side and ectoderm on the inner side.
- The chorion is formed from the trophoectoderm and mesoderm.
- The allantois and yolk sac membranes have mesoderm on the outer side and endoderm on the inner side.
Therefore, Option B is the correct answer.
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