GN 301 Homework 12: DNA Analysis for Identification and Forensics

The charge on DNA molecules is

negative

Which DNA molecule will travel further down the gel?

small pieces

Electrophoresis separates DNA fragments based on their 

size

Use the diagram of a gel below to answer the remaining questions on this quiz. A woman wants to determine the father(s) of each of her children so she can obtain child support. Information below was gathered by amplifying two STR loci in each individual and separating the fragments using electrophoresis. For each child, select who the father(s) can be based on these data. There may be more than one possible answer for a child based on this data. If none of these men could have fathered the child, select "None of these".

The father of Child #1 can be......(pick all that apply)

Man 2 or 3

DNA was obtained from a mother and her two daughters Ann and Sue. DNA was also taken from three men who could have fathered the girls. The same loci were amplified in all individuals. Results from separating the fragments are provided below. Note that the two girls do not have to have the same father. Be sure to use the information from both genes in your analysis. 

Based on these data, Ann's father could be ____

Based on these data, Sue's father could be _____

__Ed__

__None of these__

Dr. Gardner had a chocolate bar on her desk this morning. When she looked for it after lunch, she noticed it was missing, but she found a hair on her desk. She collected DNA from the hair and from each of her TAs in hopes of finding the guilty party. She amplified two STR regions from the hair, herself, and her 5 TAs. She separated the amplified fragments on a gel. The results are shown below. 

Select all who could have left the hair on Dr. Gardner's desk based on these data.

Jess