DNA Profile Probability Scenarios

Mr. Young explains DNA profile probability through examples. He covers calculating probabilities for single STRs with the same and different repeats in African-American and Caucasian individuals, respectively. He also demonstrates how to calculate probabilities for two STRs in different regions, emphasizing the use of p-squared and 2pq formulas. The video concludes with a reminder of the increasing strength of DNA evidence with more STRs.

What formula is used when the number of repeats is identical?

• 2pq formula

• p squared formula

• q squared formula

• None of the above

What is the probability of two African-American individuals having 12 repeats at the TPOX region?

• 1 in 1,306

• 1 in 7

• 1 in 878

• 1 in 995,652

What is the significance of the p-value in DNA profile probability?

• None of the above

• It indicates the number of repeats

• It represents the probability of a single allele

• It is used to calculate the height of an individual

Which formula is applied for different number of repeats?

• None of the above

• q squared formula

• 2pq formula

• p squared formula

What is the chance of two Caucasian individuals having 8 and 9 repeats at the TPOX region?

• 1 in 995,652

• 1 in 878

• 1 in 7

• 1 in 1,306

What does a 1 in 7 chance indicate in the context of DNA profiling?

• Irrelevant to DNA matching

• Low probability of a match

• Moderate probability of a match

• High probability of a match

For a Caucasian individual with two different STRs, what formulas are used?

• p squared and 2pq

• 2pq only

• p squared only

• None of the above

What is the final probability of another Caucasian individual matching both loci?

• 1 in 878

• 1 in 1,306

• 1 in 7

• 1 in 995,652

Why is the multiplication of probabilities used in the complex example?

• To find the combined probability of independent events

• None of the above

• To increase the probability of a match

• To simplify the calculation

How does the evidence strength change with more STRs analyzed?

• Becomes invalid

• Increases

• Remains the same

• Decreases