NEET2002ZoologyPrinciples of Inheritance and VariationActual
Which of the following is a correct match?
Options
- ADown syndrome =21^ st chromosome
- BSickle cell anaemia = X chromosome
- CHaemophilia = Y chromosome
- DParkinson disease = X and Y chromosomes
Correct answer
A. Down syndrome =21^ st chromosome
Step-by-step solution
Down syndrome = trisomy of 21^ st chromosome Sickle cell anaemia = autosomal recessive disorder, due to the mutation in -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