MCQ
Which one of the following develops from the trophoblast
- ✓Placenta
- BAllantois
- CEpidermis of the skin
- DYolk sac
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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.