Multiple Alleles Three or more alleles of the same gene that code for a single trait. ABO & Rh blood groups are examples.

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Presentation transcript:

Multiple Alleles Three or more alleles of the same gene that code for a single trait. ABO & Rh blood groups are examples

Blood type alleles A, B, O A & B are co dominant Either A or B, or both, are dominant over the O allele. O is recessive

Rh alleles Rh comes from rhesus monkey, the model being studied for blood types. + and – are the common ones that determine the trait

ABO system - Classifies blood according to antigens present on the erythrocytes (RBCs). May carry A, B, AB or O A & B are codominant; both are dominant over O.

Blood chart AB IAIB (AB) A,B O ii (OO) none Phenotype Genotype Antigen on RBC A IAi or IAIA (AO< AA) A B IBi or IBIB (BO, BB) B AB IAIB (AB) A,B O ii (OO) none

Rh factor 85% of population is Rh+; 15% is Rh- If Rh factors mix, the blood agglutinates. Problem – Rh- mother and Rh+ father Condition - Erythroblastosis fetalis Solution: