DNA Profiling and Analysis Techniques

The video tutorial provides study advice for IB exams, emphasizing the importance of practicing past paper questions. It explains the Polymerase Chain Reaction (PCR) technique for DNA amplification and its application in DNA profiling. The tutorial also covers gel electrophoresis and how DNA profiles can be used to determine paternity, highlighting the genetic similarities between parents and children.

Why is it beneficial to practice past paper questions before a test?

• They are not relevant to the current curriculum.

• They are often used by teachers in tests.

• They are easier than the actual test questions.

• They cover topics not included in the syllabus.

What is the primary function of the Polymerase Chain Reaction (PCR) in DNA analysis?

• To denature DNA.

• To amplify DNA.

• To compare DNA samples.

• To separate DNA strands.

Which technique is used to separate DNA fragments based on size?

• Polymerase Chain Reaction (PCR)

• DNA Denaturation

• Gel Electrophoresis

• DNA Amplification

What is the first step in creating a DNA profile from a small DNA sample?

• DNA Comparison

• DNA Amplification

• DNA Denaturation

• DNA Separation

Why can't paternity testing be used to create a DNA profile?

• It is too expensive.

• It is not accurate.

• It is used to prove relationships, not create profiles.

• It requires a large DNA sample.

How does gel electrophoresis help in DNA profiling?

• By amplifying DNA samples.

• By comparing DNA sequences.

• By separating DNA fragments based on size.

• By denaturing DNA strands.

What makes DNA profiling effective in determining paternity?

• Half of a child's DNA is inherited from each parent.

• A fraction of DNA is passed based on the number of children.

• Children have identical DNA to their parents.

• All of a father's DNA is passed to the child.

Why is option C incorrect in the context of DNA inheritance?

• The father passes on half of his genes.

• The father passes on all of his genes.

• The father passes on a fraction of his genes.

• The father passes on none of his genes.

What is the role of gel electrophoresis in DNA profiling?

• To amplify DNA samples.

• To denature DNA strands.

• To separate DNA fragments based on size.

• To compare DNA sequences.

How can DNA profiling be used to determine the father of a child?

• By analyzing the child's physical traits.

• By matching the child's DNA exactly with one parent.

• By comparing the child's DNA with potential fathers.

• By using the mother's DNA only.