Q. How many of the following diseases shows inheritance pattern similar to Mendelian factors?
Cystic fibrosis, Klinefelter's syndrome, Haemophilia, Down's syndrome, Sickle cell anemia, Colour blindness, Turner's syndrome, Thalassemia, Phenylketonuria

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Solution:

Cystic Fibrosis, Sickle cell anaemia, Thalassemia and Phenyllketonuria are autosomal recessive disorders.
Haemophilia and Colorblindness are X lined recessive disorders. They are Mendelian disorders.
Klinefelter's syndrome (XXY), Down's syndrome (Trisomy 21), Turner's syndrome (X0) are chromosomal disorders.