Which statement expresses accurately the genetic implications of ...

[saliriagwu]

Which statement expresses accurately the genetic implications of cystic fibrosis (CF)?
 
  a. If it is present in a child, both parents are carriers of this defective gene.
  b. It is inherited as an autosomal dominant trait.
  c. It is a genetic defect found primarily in non-Caucasian population groups.
  d. There is a 50 chance that siblings of an affected child also will be affected.

Question 2

-Adrenergic agonists and methylxanthines are often prescribed for a child with an asthma attack. What is their action?
 
  a. Liquefy secretions c. Reduce inflammation of the lungs
  b. Dilate the bronchioles d. Reduce infection

[macagnavarro]

Answer to Question 1

ANS: A
CF is an autosomal recessive gene inherited from both parents and is found primarily in Caucasian populations. An autosomal recessive inheritance pattern means that there is a 25 chance that a sibling will be infected but a 50 chance a sibling will be a carrier.

Answer to Question 2

ANS: B
These medications work to dilate the bronchioles in acute exacerbations. These medications do not liquefy secretions or reduce infection. Corticosteroids and mast cell stabilizers reduce inflammation in the lungs.