Answer:
If both parents are healthy carriers of the gene that causes cystic fibrosis, then their concern is justified, since they have a 25% (1:4) chance of having a child with cystic fibrosis.
Explanation:
The gene that produces cystic fibrosis is called CFTR, and its inheritance pattern is autosomal recessive.
Both parents may have the gene and not manifest the disease - healthy carriers - since the condition of homozygosity is necessary for cystic fibrosis to appear. However, they are likely to have children who are healthy, healthy carriers or sick with cystic fibrosis:
Genotype of healthy carrier parents is N/cf, where N is the normal gene and Qf is the abnormal gene.
N/cf X N/cf
Alleles N cf
N N/N N/cf
cf N/cf cf/cf
The chances of having:
- Healthy child are 25%.
- Healthy carrier child are 50%.
- Child with cystic fibrosis are 25%.
In this case, the concern of both parents is justified, since the probability of having a child with cystic fibrosis is 1:4.
Lerarn more:
Cystic fibrosis inheritance brainly.com/question/6584627
Answer:
Weathering is very important to human life since it helps us to describe the formation of various landforms, leading to the formation of building materials like clay and the remnant of weathered rock like granitic tors can act as a tourist attraction.
Answer: DNA and RNA
Explanation:
because we contain dna and rna.
the answer would be the third option: the cells change after being exposed to the chemical, and this change is passed to the next generation of cells.
