What Are The Essentials Of Blood Types And DNA?

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Lowry police asked my laboratory group and I to investigate the remaining human skull and blood samples found at a crime scene in an abandoned building in Lowry. The investigators found two types of blood samples from the crime scene, one that is B-, which appears to be from the victim and the other sample O+ is believed to be from the criminal. The police provided four blood samples from their potential suspect list, and also provided the medical records of a missing teenager who blood type is B-. In order to continue our investigation, we needed to review the essentials concepts of blood types and human skeleton. According to The Royal Society of Medicine Health Encyclopedia (2000), a reliable source that presents crucial medical concepts, …show more content…
In the same way, the fluid (without blood cells) contains antibodies that reject all the groups that are not displayed in the blood cells. For this reason when blood tests are done, the blood sample is exposed to different antibodies (A, B, AB or O) to determine the group it belongs to. In addition, there is another essential factor present in blood, the Rh group. The Rh group is divided in Rh+ and Rh-, there are several alleles that participate in this group and it is based on inheritance (dominant/recessive alleles.) If the person is homozygous or heterozygous dominant, then they would have Rh+ and produce antibody D, in contrast, if they are homozygous recessive then they will have Rh- and do not produce antibody D. In the same way, when blood samples are exposed to antibody D and agglutination happens, it means that that particular sample has the Rh+ group. Based on this information, we analyzed the four samples to narrow the police department’s investigation. In addition, we needed to evaluate the ethnicity and gender of the skeletal remains to verify if it matches with the missing person, Sarah …show more content…
In accordance to Walker-Pacheco (2010), author of our laboratory book, sex encompasses biological characteristics that determine if a person is male or female. On the other hand, ancestry is the geographical location where your ancestors come from. Some characteristic of a European descent male will vary from an African descent female and an Asian descent male. According to Walker- Pacheco (2010), author of our laboratory book, the most influential characteristics that help determine sex are: overall skull size, shape of forehead, supraorbital ridge, mastoid process, orbital shape, nuchal area and occipital protuberance and chin shape. In the same way, the most significant characteristics that help determine ancestry are: nasal root, lower border of nasal aperture, orbital shape, malar tubercle, dental shape, lingual side of

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