PATHOLOGY

PATHOLOGY MCQ

GENETICS AND DISEASE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
How does Cystic Fibrosis occur?
A
autosomal recessive
B
sex-linked recessive
C
autsomal mutation
D
nondisjunction (extra 21st chromosome)
Explanation: 

Detailed explanation-1: -This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.

Detailed explanation-2: -Cystic fibrosis is an example of a recessive disease. That means a person must have a mutation in both copies of the CFTR gene to have CF. If someone has a mutation in only one copy of the CFTR gene and the other copy is normal, he or she does not have CF and is a CF carrier.

Detailed explanation-3: -To have an autosomal recessive disorder, you inherit two changed genes, sometimes called mutations. You get one from each parent. Their health is rarely affected because they have only one changed gene. Two carriers have a 25% chance of having an unaffected child with two unaffected genes.

Detailed explanation-4: -Cystic fibrosis (CF) is a common life-shortening autosomal recessive genetic disorder caused by mutations in the gene that encodes for the cystic fibrosis transmembrane conductance regulator protein (CFTR). Almost 2000 variants in the CFTR gene have been identified.

Detailed explanation-5: -CF is caused by genetic changes in the CFTR gene and inheritance is autosomal recessive.

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