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biology/G11 Pre-AP Biology/Other patterns of inheritance.md

@@ -5,4 +5,27 @@ Incomplete dominance is when neither allele is dominant, therefore a heterozygou
 Example being two flours homozygous red flowers and homozygous white flowers producing pink flowers.
 If you then breed these pink flowers together, there's 25% chance of red flowers, 25% chance for white flowers and 50% chance of pink flowers.
 
-Co dominance is when both alleles are dominant. Therefore a heterozygous will have both alleles fully expressed.
+Co dominance is when both alleles are dominant. Therefore a heterozygous will have both alleles fully expressed.
+
+For blood types, A and B are codominant, O is recessive.
+
+Example dihybrid cross begin:
+
+Let $I^a$ rep A blood allele. } codominant
+Let $I^a$ rep B blood allele. } ^ 
+Let i rep O blood allele. } recessive
+$P_1$: $I^AI^A * ii$
+Gamete: $I^A I^A * i i$
+
+$F_1$:
+
+|     | $I^A$  | $I^A$  |
+| --- | ------ | ------ |
+| i   | $I^A$i | $I^A$i |
+| i   | $I^A$i | $I^A$i |
+Phenotypes:
+100% $I^Ai$
+Genotype:
+100% A blood.
+
+Example end.