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erica [24]
2 years ago
15

How is mitochondrial DNA (mtDNA) typing used in forensic science?

Biology
2 answers:
V125BC [204]2 years ago
4 0
An unknown mtDNA sample is matched to a sample of nuclear DNA that was found at a crime scene.
netineya [11]2 years ago
3 0

Answer:

Mitochondrial DNA typing is a method used by forensic scientists which match the DNA of unknown sample to the sample collected from the crime scene.

This typing method posses several advantages over other nuclear DNA typing methods in forensic science as:

  • A large copy number of DNA (2-10 times) per mitochondria provide enough DNA sample.  
  • Depending on the functions, a cell can have many mitochondria (1-100) which can provide enough sample for typing.
  • No recombination takes place in mitochondrial DNA so DNA sample remains unchanged over many generations. So, the sample can be matched easily with the relatives of the unknown sample.
  • Mitochondria show only maternal inheritance that they take DNA from mitochondria of the mother.
  • DNA is amplified using Polymerase chain reaction which undergoes direct sequencing.

Thus, mitochondrial DNA typing has several advantages in forensic science.

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Examination of a cell by transmission electron microscopy reveals a high density of ribosomes in the cytoplasm. This observation
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Answer: Proteins.

Explanation:

Ribosomes are cellular organelles, the protein builders the cell. They link amino acids together in the order specified by the genetic material, so the result is a long chain of amino acids that form a protein.<u> Free ribosomes  found in the cytoplasm are important because they produce proteins</u> which are essential for internal cellular activity.

The advantage of having a high density of ribosomes working at the same time is speed, as proteins are made one after another. Then, the more ribosomes there are, the more proteins there will be.

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2 years ago
A fly has two alleles for the color of its eyes. the green allele is recessive and is represented by q. the blue allele is domin
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The answer would be C. 0.34

So
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2 years ago
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Some chefs sometimes wrap meat in papaya leaves and the meat is marinated for five hours before it is cooked. What is the purpos
Charra [1.4K]

Answer:

See the explanation below.

Explanation:

Marinades serve two different functions: as a tenderizer and flavor enhancer.

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As far back as pre-Columbian Mexico, cooks found that wrapping meats in papaya leaves before cooking made for more tender results. The active enzyme in the papaya leaves is papain, now refined from papayas and commercially available. The connective tissue that comes in direct contact with the protein-digesting enzymes gets broken down. These tenderizing enzymes also reduce the capability of the meat to hold its juices, resulting in greater fluid loss and thus drier meat.

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