DNA Analysis and Electropherogram Interpretation

The video tutorial explains how to complete a CODIS submission worksheet by analyzing DNA fingerprints. It covers identifying major and minor contributors, analyzing electropherogram peaks, and determining major alleles. The tutorial provides examples of gene analysis and concludes with final instructions for completing the worksheet.

What is the primary purpose of a CODIS submission worksheet?

• To record the results of a DNA fingerprint analysis.

• To track the inventory of laboratory equipment.

• To submit a request for new laboratory supplies.

• To document the attendance of students in class.

In the context of DNA samples, what does the term 'major contributor' refer to?

• The first person to handle the DNA sample.

• The individual who provided the most DNA in a sample.

• The largest peak on an electropherogram.

• The person who analyzed the DNA sample.

What is the significance of the peaks on an electropherogram?

• They measure the volume of the DNA sample.

• They indicate the presence of specific alleles.

• They show the temperature of the laboratory.

• They represent the time taken for analysis.

How can you determine if an allele is a major contributor from an electropherogram?

• By counting the number of peaks present.

• By comparing the amplitude of its peak to others.

• By checking the color of the peak.

• By measuring the width of the peak.

Which alleles were identified as major contributors for the gene D3S1358?

• 15 and 16

• 16 and 18

• 15 and 18

• 17 and 18

For the gene THO1, which allele was identified as homozygous for the major contributor?

• 9.3

• 7

• 9

• 7.5

What should be done if a peak does not register on the ladder in an electropherogram?

• Ignore it as it might be a stutter or contaminant.

• Consider it as a major contributor.

• Record it as a new allele.

• Use it to determine the sample's origin.

Which alleles were identified as major contributors for the gene D21S11?

• 30

• 28

• 29

• 28 and 30

For the gene D8S51, which alleles were identified as major contributors?

• 15 and 20

• 18 and 20

• 14 and 15

• 14 and 18

What is the next step after identifying alleles for the initial genes in the worksheet?

• Continue identifying alleles for the remaining genes in order.

• Submit the worksheet for review.

• Reanalyze the initial genes.

• Discard the worksheet and start over.