Question

The diagram shows how fraternal twins (nonidentical twins) form. A pregnancy test checks for the presence of a chemical called HCG that the blastocyst secretes. The HCG levels of some women may be an early indicator of twins. Based on the diagram, why do you think the HCG levels may be different for women carrying twins and women carrying a single child?

Answer 1

If you have just found out that you are pregnant and you think that it may be twins due to high HCG levels twins, ask your OB to conduct further tests in order to deny or confirm this. Keep in mind that a single HCG reading will typically not provide sufficient

Step-by-step explanation:

Answer 2

(You may want to paraphrase this because its the exact sample answer)

Because there are two fertilized eggs, two blastocysts form. So, it’s possible that a woman carrying twins will have higher HCG levels than a woman carrying a single child.

Step-by-step explanation: