BI204 Fall 2018 Lab 4 -Blood Typing Name Questions You investigate a homicide ca
ID: 144042 • Letter: B
Question
BI204 Fall 2018 Lab 4 -Blood Typing Name Questions You investigate a homicide case using the following information. A young couple on th the Grand Canyon dis dental records. A thorough examination of the wife's bones indicate a blunt force trauma to the skull. The husband's remains have not been found. The husband is now a suspect in his wife's murder. Two distinct blood samples and tissue samples are found at the scene of the crime. Genetic testing that one sample is male and the other is female. The female blood sample is type A. The male blood sample is type AB. You take the following information from the parents of the victim and her husband. eir honeymoon to appear. The remains of the wife are found one week later and identified based on indicates 1) The wife's parents have the following blood types. Her father is type O and her mother is type A. Genotyping of the parents indicate the following genotypes: Fill out the Punnet Square below for the wife's parents. 2) What are the possible genotypes of the wife and her siblings? 3) Could the blood sample found at the scene have belonged to the wife?Explanation / Answer
Punnet square (Wife’s parents)
IO
IO
IA
IAIO
IAIO
IO
IOIO
IOIO
Possible genotypes (and the phenotypes) of wife and her siblings are as follows:
Genotypes
Phenotypes
IAIO
A
IAIO
A
IOIO
O
IOIO
O
The blood sample of female mentioned in the crime scene had blood group A. From the above table, there is a 50% chance for the occurrence of blood group A. Hence, the blood sample of crime scene belonged to the wife.
Punnet square (Husband’s parents)
IO
IO
IA
IAIO
IAIO
IB
IBIO
IBIO
Possible genotypes (and the phenotypes) of wife and her siblings are as follows:
Genotypes
Phenotypes
IAIO
A
IAIO
A
IBIO
B
IBIO
B
The blood sample of male mentioned in the crime scene had blood group AB. From the above table, none of them showed the occurrence of AB. Hence, the blood sample of crime scene did not belong to the husband.
The husband is not guilty. Reason is is blood group is not matching with the blood group identified in the crime scene.
IO
IO
IA
IAIO
IAIO
IO
IOIO
IOIO
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