Both parents have 2 blood alleles of 3 types: A, B, and O.
Thus, parents can be type A (AA or AO), type B (BB or BO), type AB, or type O (OO).
When they have a child, the child gets one allele from the mother, and one from the father.
So, if both parents have type AA, the child will be type AA. If both have type AO, the child can be type A or O. It's rather simple.
multiple allelic series
It's like incomplete dominance, but instead of one allele not being completely dominant for a trait, both alleles for that specific trait are dominant.A condition in which neither of two alleles of a gene is dominant nor recessive
Polygenic inheritance
Multiple gene inheritance. Sree
It depends on what you mean by "both are expressed". In order for both alleles to be expressed, both alleles must be dominant alleles. If one allele is recessive, it will be masked. If you are talking about alleles that are co-dominant, then both alleles would be expressed together. Ex: Red x white = red and white flower If you are talking about incomplete dominance, then both alleles are seen as a blend of both in the offspring. Ex: red x white = pink flower If you are talking about multiple alleles (like in human blood typing), then you can see 2 alleles expressed together. Ex: Type A x Type B can produce AB blood type.
Types of dominance, multiple alleles, sex linked inheritance, polygenic inheritance and maternal inheritance.
codominant alleles
codominace
multiple allelic series
The presence of more than two alleles that control a trait is called multiple allele. An example of this is the group gene of ABO blood that has three alleles.
The pattern of inheritance in which both alleles contribute to the phenotype of the organism is codominance. For example white and red hair color in cattle. Black and white feather color in certain chickens.
It's like incomplete dominance, but instead of one allele not being completely dominant for a trait, both alleles for that specific trait are dominant.A condition in which neither of two alleles of a gene is dominant nor recessive
A 3:1 phenotypic ratio (Mendelian inheritance).
Incomplete dominance
Alleles for both the red hairs and white hairs are used. This is a typical pattern of the codominance.
Gregor Johann Mendel is credited with discovering the pattern of genetic inheritance
Alleles for both the red hairs and white hairs are used. This is a typical pattern of the codominance