Cystic fibrosis is a recessive genetic disorder caused by a mutation of the CTRF gene. The disease is characterized by excessive mucus production along the respiratory and digestive tracts in addition to other symptoms. Cystic fibrosis is a progressive disorder that is most associated with chronic respiratory disease.

Question

Sara and Anthony found out that they are both carriers of the disorder, but neither have the disease. What are the chances their child will be born with cystic fibrosis?

A. 0:4
B. 4:4
C. 1:4
D. 1:2

Answer 1

the gene is recessive; so the carriers have a normal CTRF gene, coupled with a recessive

the possible genotypes of the offspring are
... CC, Cr, rC, rr
... out of four possibilities
... one normal
... two carriers
... one with the disorder

Answer 2

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Answer 3

Cystic fibrosis is a recessive genetic disorder caused by a mutation of the CTRF gene. The disease is characterized by excessive mucus production along the respiratory and digestive tracts in addition to other symptoms. Cystic fibrosis is a progressive disorder that is most associated with chronic respiratory disease.
Sara and Anthony found out that they are both carriers of the disorder, but neither have the disease. What are the chances their child will be born with cystic fibrosis?

Answer 4

1:4, Your welcome;)