A) Cystic fibrosis
Correct Answer: D
Solution :Cystic fibrosis: It is a common disorder of Caucasian race in which thick and more salty mucus blocks the respiratory tract. The homozygous recessive condition produces the defective protein which regulates the chloride transport channel. Cretinism: In this disorder, the physical growth, mental growth and sexual growth in children is retarded. Such a dwarf and sterile child is called a cretin. It is due to hyposecretion of thyroid hormones. Thalassemia: It occurs due to the defective production of a or ft chains of haemoglobin, autosomal recessive. These are distinguished under two types, namely, major - Homozygous, minor - Heterozygous and \[\beta .\] Haemophilia: Sex linked disorder due to defective recessive gene.
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