Respuesta :
The only double helices in DNA that is composed of both 14N and 15N strands are 14N/15N
What is DNA sample?
Blood, buccal swabs, hair, teeth, fingernails, tissues from internal organs (including the brain), muscle, and skin can all be taken as samples from unidentified bodies. Oral buccal swabs are the most widely used and trustworthy form of sample collection for DNA testing. In addition to being used as evidence in court, it is also utilized to locate biological relatives, identify bodies, and find disease remedies.
DNA Evidence Types and Analysis:
Short Tandem Repeats (STR), Y-Chromosome, and Polymerase Chain Reaction (PCR).Cell mitochondrial DNA
Different bands are formed as a result of the different densities of the double helices of the elements 14N/14N, 14N/15N, and 15N/15N. The bands 14N/14N at the top, 14N/15N in the middle, and 15N/15N at the bottom all have a similar shape.
There are only 15N/15N double helices in DNA from cells grown in 15N.
There are only 14N/14N double helices in the DNA of cells grown in 14N.
Both 14N/14N and 15N/15N double helices can be found in a 1:1 mixture of DNA produced by cells grown in 14N and 15N.
It contains 14N/14N, 14N/15N, and 15N/15N double helices when DNA from cells grown in 14N and 15N is heated and then cooled in a 1:1 ratio
To know more about DNA sampling refer to the given link below,
https://brainly.com/question/264225
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