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Mendelian Dominant Recessive Traits

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Hair color, eye color and widows peak are all Mendelian dominant recessive traits. If a couple who is heterozygous (both of them mind you) for each of the three traits what are the odds that they will have a child that has dark hair (Dom), Blue Eyes (Rec) and a widows peak (Dom). I think the answer should be a fraction with the denominator being over 50.

Is it possible a child was switched at birth if the child's blood type is not Couple 1's theirs, they think a switch must have occurred. Couple 1 (the plaintiffs) have AB+ and 0+ blood, and their son has 0+ blood. Couple 2 (the other couple from the hospital) have B+ and A+ blood. Their child has B+ blood. Is couple number one right on their assumption and why? They are all parents and their is no milkman or postman involved. My thought is no it is not correct that the child of couple one belongs to couple one but why if that is even correct.

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This solution provides assistance with the questions attached regarding mendelian dominant recessive traits.

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Umut Oltulu, MBA
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  • BSc, Dokuz Eylul University
  • MBA, Texas A&M University-Kingsville
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