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# problem1 - University of California San Diego ECE15...

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University of California San Diego ECE15: Engineering Computation Final Exam: Problem # 1 Every person’s blood has two markers called ABO alleles. Each of the markers is represented by one of three letters: A , B , or O . This gives six possible combinations of these alleles that a person can have, each of them resulting in a particular ABO blood type for that person. Likewise, every person has two alleles for the blood Rh factor, represented by the characters + and - . Someone who is “ Rh positive” has at least one + allele, but could have two. Someone who is “ Rh negative” always has two - alleles. Here are the corresponding tables: Allele Combination Rh Factor + + + + - + - - - Allele Combination ABO Blood Type AA A AB AB AO A BB B BO B OO O The overall blood type of a person is a combination of ABO blood type and Rh factor. The blood type is written by suffixing the ABO blood type with the + or - representing the Rh factor. Examples in- clude A + , AB - , and O - . Blood types are inherited: each biological parent donates one ABO allele (randomly chosen from their two) and one Rh factor allele to their child. Therefore two ABO alleles and two Rh factor alleles of the parents determine the child’s blood type. For example, if both parents of a child have blood type A - , then the child could have either type A - or type O - blood. On the other hand, a child of parents with blood types A + and B + could have any blood type.

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