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Ray Of Light [21]
2 years ago
5

100 POINTS)Which change is an environmental effect of building dams?

Biology
1 answer:
otez555 [7]2 years ago
3 0
D i took the test 2022
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Cystic fibrosis is a recessive genetic disorder caused by a mutation of the CTRF gene. The disease is characterized by excessive
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Answer:

Since both Anthony and Sara are healthy carriers of the gene that causes cystic fibrosis, the chance of having a child with this disease are 1:4 (option D).

Explanation:

The inheritance pattern of cystic fibrosis is autosomal recessive, and considering that both parents carry the abnormal CFTR gene, it can be said that the parental genotypes are:

<em>Anthony N/Qf </em>

<em>Sara N/Qf </em>

Where N is the normal gene and Qf is the abnormal gene.

Since this is an autosomal recessive disorder, only the homozygosity of the defective allele will cause the disease to manifest :

N/Qf X N/Qf

<em>Alleles     N       Qf </em>

<em>N            N/N    N/Qf </em>

<em>Qf           N/Qf  Qf/Qf </em>

  • The chances of having a healthy child are 25%.
  • The chances of having a carrier child are 50%.
  • The chances of having a child with cystic fibrosis are 25%.

Therefore, the chance of Anthony and Sara having a child with cystic fibrosis is 1:4.

Learn more:

Cystic fibrosis inheritance brainly.com/question/6584627

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