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2021-05-15

What forms the rungs of the DNA ladder?

What forms the rungs of the DNA ladder?

Other combinations of the atoms form the four bases: thymine (T), adenine (A), cytosine (C), and guanine (G). These bases are the rungs of the DNA ladder. (It takes two bases to form a rung — one for each side of the ladder.) A sugar molecule, a base, and a phosphate molecule group together to make up a nucleotide.

What kind of pattern do you notice with the structure of DNA?

When it comes to the structure of DNA, building block-nucleotides are attached together to form two long strands that spiral to create a structure known as a double helix. If double helix structure is a ladder, the phosphate and sugar molecules would be the sides, while the nitrogenous bases would be the rungs.

Which blotting technique is used in DNA fingerprinting?

Southern blotting

What is the difference between DNA fingerprinting and DNA profiling?

DNA fingerprinting refers to the analysis of DNA to identify individuals, while DNA profiling refers to the analysis of individuals’ DNA characteristics for forensic studies.

What can be used for DNA profiling?

One of the current techniques for DNA profiling uses polymorphisms called short tandem repeats. Short tandem repeats (or STRs) are regions of non-coding DNA that contain repeats of the same nucleotide sequence. STRs are found at different places or genetic loci in a person’s DNA.

What is probe in DNA fingerprinting?

A probe is a single-stranded sequence of DNA or RNA used to search for its complementary sequence in a sample genome. The probe is placed into contact with the sample under conditions that allow the probe sequence to hybridize with its complementary sequence.

How RFLP is used in DNA fingerprinting?

Restriction fragment length polymorphism (RFLP) is a technique that exploits variations in DNA sequences. DNA from differing sources will have variations or polymorphisms throughout the sequence. RFLP analysis requires that a probe to a specific area of DNA be used to identify specific locations.

What is the importance of DNA polymorphism in DNA fingerprinting?

Since DNA from every tissue, from an individual show the same degree of polymorphism, they become very useful identification tool in forensic applications. If an inheritable mutation is observed in a population at high frequency, it is referred to as DNA polymorphism.

How is DNA polymorphism helpful in DNA fingerprinting?

The oldest method used in DNA fingerprinting studies is restriction fragment length polymorphism (RFLP) analysis. This approach detects differences in DNA fragment lengths due to the presence or absence of a restriction enzyme site, or due to an insertion or deletion that occurs between two restriction enzyme sites.

What causes polymorphism in DNA?

DNA polymorphisms are produced by changes in the nucleotide sequence or length. These result from: (i) Variations in the fragment length pattern produced after digesting DNA with restriction enzymes, (ii) Variations in the size of a DNA fragment after PCR amplification, and (iii) Variations in the DNA sequence itself.

What is called DNA polymorphism?

DNA polymorphisms are the different DNA sequences among individuals, groups, or populations. Polymorphism at the DNA level includes a wide range of variations from single base pair change, many base pairs, and repeated sequences. DNA polymorphisms are endless, and more discoveries continue at a rapid rate.