MCQ
Restriction endonucleases are
- ASynthesized by bacteria
- BPresent in mammalian cells for degradation of $DNA$
- ✓Used in genetic engineering
- DUsed for in vitro $DNA$ synthesis
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$(1)$ Haemophilia is a sexlinked recessive disease.
$(2)$ Down’s syndrome is due to aneuploidy.
$(3)$ Phenylketonuria is an autosomal recessive gene disorder.
$(4)$ Sickle cell anaemia is an $X$-linked recessive gene disorder.