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.
In order for both traits to be expressed the two alleles of the heterozygote must be co-dominant. It is also dependent on whether the partner is homozygous or heterozygous for the same trait.
So to answer the question there is no real pattern for co-dominance unless the partner's genetics are known. Co-dominance is what makes cows black and white and makes flowers with pink petals (co-dominance of the white and red allele).
The variations based on each possible partner are too complicated to get into. A more specific question would be good.
incomplete dominance
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
yes but the mans genes are shown more in the child is that your question cause i might be totaly wrong. ---- Genes from each parent show equally and codominant alleles produces a interleaved pattern rather than a blended pattern like incomplete dominance genes.
Types of dominance, multiple alleles, sex linked inheritance, polygenic inheritance and maternal inheritance.
codominant alleles
codominace
multiple allelic series
No, recessive traits refer to the inheritance pattern of the allele. In the simple case where a trait is either expressed or not, if it is a recessive trait it will only be the expressed phenotype when it is homozygous. Dominant allele phenotypes will show if the genotype is heterozygous.
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.
Had the same problem on my homework can`t figure it out.... do you go to WLHS?
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.