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4 years ago

Describe the most common molecular mechanism for recessively inherited human genetic diseases such as cystic fibrosis.

Biology

1 answer:

Marta_Voda [28]4 years ago

6 0

Answer:

Explanation:

cystic fibrosis is an autosomal recessive disorder. When the child receives the defective gene from both of his parents, he suffers from cystic fibrosis. Because his parents are carriers. In recessive genetic disorder, the genes will be expressed when both recessive genes are present in one person. The person suffering from this disease have a lung infection and pancreatic dysfunction.

In this cystic fibrosis, genes are located in chromosome 7. The effective gene is the CFTR gene. The CFTR gene is present in the DNA and by transcription, this forms CFTR protein. This is a channel protein and transports chloride ion.

This CFTR protein transports chloride ions and it makes a balance in the cell membrane. These genes are commonly present in the epithelial cells. Outside the epithelial mucus is present to keep the cells moist.

The epithelium gets a lack of water and chloride due to the defect. Therefore cells need CFTR proteins also. This causes lung infection and pancreatic disorder.

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Define the first two laws of thermodynamics, and define them using examples for each law.

o-na [289]

FIRST LAW OF THERMODYNAMICS *the total heat energy applied to the system is equal to the sum of the change in internal energy of the system and the work done by the system.


SECOND LAW OF THERMODYNAMICS (entropy) *no process in w/c the total entropy decreases is possible when all the systems taken apart in the process are considered.

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 THIRD LAW OF THERMODYNAMICS *The entrophy of a perfect crystal of a substance at the absolute temp. is zero.

I hope this helps! <3

5 0

3 years ago

Which statementbest describes the influence that parents have on whether or not offspring inherit a genetically inherited trait?

umka21 [38]

Each parent contributes one allele describes the influence that parents have on whether or not offspring inherit a genetically inherited trait.

Explanation:

Allele is a form of gene present on the chromosome. Human have 2 alleles for a trait on a chromosome. Each parent contributes one of its allele to the progeny.The alleles for the gene are present on the same locus of chromosomes.

The alleles are either dominant or recessive. The contribution of alleles and the expression of trait decide the alleles of offspring.

The phenotype is determined by the allele expressed as short or tall and human ABO blood type.

An allele is sequence of DNA. The organism having two same alleles are homozygous and having two different alleles are heterozygous.

7 0

3 years ago

Which of these is a non-renewable resource? Trees Water Fuel Wind

Sati [7]

Trees can be made again . Water is a natural resource fuel is too . Wind

3 0

3 years ago

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Which statement describes how the atmosphere gains energy by convection?(1 point)

Bezzdna [24]

Answer:

Solar energy warms gases that make up air

5 0

3 years ago

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Population of Rabbits based on Leg Length

stich3 [128]

Answer:

B) The rabbits with medium length legs are the most stable and thus will out survive the others.

D) It is unlikely that evolution is occurring because none of the traits have disappeared from the population.

Explanation:

The graph shows that rabbits with longer legs are more likely to have a selective advantage that allows them to survive and reproduce than shorter legs. Throughout the generations, it shows that the number of short legs have decreased, and the number of medium length legs neither have advantage or disadvantage.

7 0

3 years ago

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