Question

question 20
in therapeutic cloning, why are the embryonic cells used to treat an individual not rejected by that individual?
the cells are embryonic
the individuals immune system is suppressed with drugs
the embryonic cells are cloned from the same individual they are injected into
they are rejected, and that is why this has not worked yet

Explanation:

In therapeutic cloning, the goal is to avoid immune rejection. When embryonic cells are cloned from the same individual they are injected into, the cells have the same genetic - and thus immunological - profile as the recipient. The immune system recognizes "self" cells and does not mount an immune response against them. If cells were from a different individual (even if embryonic), the immune system would likely recognize them as foreign. Suppressing the immune system with drugs (a common approach in organ transplantation from non - genetically related donors) is not needed here as the cells are a genetic match. And the statement "they are rejected, and that is why this has not worked yet" is incorrect as therapeutic cloning aims to prevent rejection.

Answer:

The embryonic cells are cloned from the same individual they are injected into.