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In an article by ScienceMag,
The mutation that causes cystic fibrosis may actually serve a useful purpose: protecting against typhoid fever. Typhoid fever is most common in non-industrialized countries. Travelers to Asia,Africa, Eastern Europe, and Latin America are especially at risk. This means having the rr or Rr trait for CF is beneficial in those countries and continents because it could allow one to live longer.

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There’s no cure for cystic fibrosis, but lifestyle choices, treatments, and medications can help.
Such as...

maintaining adequate nutrition

preventing or treating intestinal blockages

eliminating mucus from the lungs

preventing infection

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This unaffected carrier will have partially mutated and non-mutated CFTR protein channels. As a the random gene is chosen, the structure of the CFTR for this individual could become mutated.
Symptoms:
None

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Mutation in the CFTR gene cause individual with both mutated alleles to become affected with cystic fibrosis. This individual's children will be either unaffected carriers or affected, depending on whether he or she mates with someone who is a carrier unaffected, unaffected, or affected. This person will only have mutated CFTR protein channels.
Symptoms:
- Thick and Sticky Mucus forms in a attempt to trap any bacteria
- Lack of oxygen due to mucus blockage of gas exchange in alveoli

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This individual's children will either be carriers + unaffected or be unaffected, depending on whether he or she mates with someone who is a carrier or unaffected. This person will not have ANY mutated CFTR protein channels.
Symptoms:
None

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The parents of a child with CF are unaffected, healthy carriers of the condition and have one normal gene and one abnormal gene. With each pregnancy, carrier parents have a 25 percent chance of having a child with two copies of the abnormal gene resulting in CF. Carrier parents have a 50 percent chance of having a child who is an unaffected carrier and a 25 percent chance of having an unaffected, non-carrier child.

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Gene are a piece of DNA that codes for protein. The gene creates instructions for creating the protein/channel that transport chloride in and out of the cells. When a protein channel is created a random gene is chosen to determine its structure.

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-Genes are randomly selected
- A genotype with four genotype combinations only has three.
- Two beings have to contribute to offspring's genetics
- Each parent only two copies of a gene/alleles
- Offspring always has two copies of a gene