Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

Down syndrome $=$ trisomy of $21^{\text{st }}$ chromosome Sickle cell anaemia $=$ autosomal recessive disorder, due to the mutation in $\beta$-globin gene of haemoglobin, on chromosome 11 Haemophilia $=$ Sex linked recessive disease, caused due to deficiency of clotting factor VII or IX Parkinson Disease $=$ caused by a loss of nerve cells in the part of the brain, that produce neurotransmitter dopamine