MCQ
Which one of the following develops from the trophoblast
- ✓Placenta
- BAllantois
- CEpidermis of the skin
- DYolk sac
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Assertion $(A):$
Polymerase chain reaction is used in DNA amplification
Reason $(R):$
The ampicillin resistant gene is used as a selectable marker to check transformation
In the light of the above statements, choose the correct answer from the options given below :