OBJECTIVE LIFE SCIENCE
GENETICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A and O are codominant, B is recessive.
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B and O are codominant, A is recessive.
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A and B are codominant, O is recessive.
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A, B and O are all codominant with each other.
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Detailed explanation-1: -The fourth option, The inheritance of blood type in humans is an example of codominace, is the correct answer. Codominance is a phenomenon in which both alleles that an organism carries are expressed in the phenotype.
Detailed explanation-2: -Dominant alleles will mask recessive alleles. In the case of blood type, A and B are both dominant over O. Therefore, if you inherit one A or B allele and an O allele, your blood type will be the dominant type (A or B). This also means that the only way for someone to have type O blood is if they have two O genes.
Detailed explanation-3: -For human blood types, the alleles for types A and B are codominant, but both are dominant over the type O allele. The Rh factor is separate from the ABO blood group and is located on a separate chromosome. The Rh+ allele is dominant over the Rh-allele.