MCQ
A pond is a
- ABiome
- ✓Natural ecosystem
- CArtificial ecosystem
- DCommunity of plants and animals
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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.