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andre [41]
3 years ago
6

Most children with cystic fibrosis have frequent lung infections and digestive difficulties. Some people have mild cases, with o

nset of minor respiratory problems in adulthood. Some men with cystic fibrosis only exhibit the symptom of infertility. Which exception to Mendelian laws of inheritance best explains these symptoms?1.) incomplete dominance2.) pleiotropy3.) epistasis4.) codominance5.) overdominance
Biology
1 answer:
hram777 [196]3 years ago
3 0

Answer:

The correct answer is 4: "The exception to Mendelian laws of inheritance that best explains the mentioned symptoms is codominance".

Explanation:

In codominance, both alleles can be expressed. In these cases, heterozygote individuals<em> instead</em> of showing an <em>intermediate phenotype</em>, express both of the alleles. Their phenotype is an additive expression of their parents' genes.

In cystic fibrosis, there is a gene responsible for coding for a protein named "cystic fibrosis transmembrane conductance regulator, CFTR".

-Most of the people have two copies of the normal allele and produce the functional CFTR protein form.

-Patients with cystic fibrosis have two copies of the mutated allele and so produce the mutated and dysfunctional form for this protein.

-Heterozygote people possess only one normal CFTR allele and a mutated form for the same allele and produce a normal protein and a mutated protein.

In the last case, both alleles are codominant and they express in heterozygote individuals. Given the fact that the normal allele produces enough functional CFTR protein, these individuals do not have any adverse effect and the mutated allele is recessive at a physiological level.

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What is Random error in science ?
Yuki888 [10]

Answer:

There are two types of errors: random and systematic. Random error occurs due to chance. ... Random error may be caused by slight fluctuations in an instrument, the environment, or the way a measurement is read, that do not cause the same error every time. In order to address random error, scientists utilized replication.

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7 0
3 years ago
What role does molecular evidence play in determining how closely two species are related to each other?
defon
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8 0
4 years ago
The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-Saharan Africa than among those o
Ivanshal [37]

Ans.

Sickle-cell disorder is a genetic disorder, which shows defected red blood cells, due to mutation in the genes for hemoglobin protein.

Malaria is common in sub-Saharan Africa region and there, natural selection favored gene for sickle cells, because it might be beneficial to people having sickle cell disease that makes them able to survive in such condition and transmit their genes to offspring.

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Hence,  sub-Saharan African population shows higher percentage of mutated gene for sickle cell as compared to population of United States.

Thus, the evolutionary process behind this difference is 'natural selection.'

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Answer:

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