DNA Profiling and Analysis Concepts

Michael Meda explains how DNA samples are compared using DNA profiling, focusing on short tandem repeats (STRs). The process involves obtaining DNA samples, using primers to identify STRs, amplifying fragments through PCR, and comparing them via gel electrophoresis to determine relationships, such as parentage.

What is the primary purpose of DNA profiling?

• To identify genetic disorders

• To measure DNA length

• To determine the age of an individual

• To establish parentage

What are short tandem repeats (STRs) in DNA?

• Long sequences of DNA

• Four base repeats in DNA

• Single nucleotide polymorphisms

• Non-repetitive DNA sequences

How do STRs differ between unrelated individuals?

• They are longer in one individual

• They are completely absent

• They have different numbers of repeats

• They are identical

What role do primers play in DNA analysis?

• They amplify DNA without PCR

• They attach to STRs to create fragments

• They sequence the entire genome

• They cut DNA into smaller pieces

What is the purpose of PCR in DNA profiling?

• To sequence DNA

• To amplify DNA fragments

• To cut DNA into smaller pieces

• To identify genetic mutations

How are DNA fragments compared between individuals?

• By counting the number of fragments

• By running them through gel electrophoresis

• By measuring their length

• By sequencing the entire genome

What does a similar pattern in gel electrophoresis indicate?

• The individuals have identical DNA

• The individuals are unrelated

• The individuals share a genetic relationship

• The DNA samples are contaminated

What can be concluded if two DNA samples show different patterns in gel electrophoresis?

• The samples are contaminated

• The samples are from unrelated individuals

• The samples are from the same individual

• The samples are identical

What is the significance of gel electrophoresis in DNA profiling?

• It cuts the DNA into fragments

• It creates a visual pattern for comparison

• It amplifies the DNA

• It sequences the DNA