2107 Final Lab Report

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Who Are My Parents? A Determination of Identity through Blood and DNA Testing (Diane) Ailis Ward 001107190 BIOL 2107, Fall 2013 Abstract Three baby girls were born on the same day in the same hospital. Through human error, their identities were unknown. Each child and parent set were subjected to blood typing to determine family groups; however this testing proved inconclusive, so the families were also tested for an X-linked recessive trait through sampling DNA and running the fragments through a gel electrophoresis apparatus. How could a hospital laboratory properly identify which child belonged to each set of parents if the children had not been accurately tracked from birth? And how do hospital transfusions actually work? Four basic blood phenotypes exist: A, AB, B and O. For example, if parent A has AB blood and parent B has type O blood, according to basic Mendelian genetics, | |O |O | |A |AO |AO | |B |BO |BO | their offspring can either be phenotype A or phenotype B. Note that in all possible cases, each child has an O allele in addition to his/her phenotypic blood expression. A and B are dominant alleles when paired with an O allele and co-dominant when they appear together in the genotype AB. On the other hand, allele O is recessive; therefore both parents must contribute an O allele for their offspring to express type O blood. What possible genotypes result from both parents having type AB blood? | |A |B | |A |AA |AB | |B |AB |BB | This case reveals the two remaining possible genotypes, AA and BB, which express type A blood and type B blood respectively. One now understands that both genotypes AA and AO express phenotype A blood while both genotypes BB and BO express phenotype B blood due to the dominance of

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