(a) Genotypic rate
- Normal 25
- Carrier 50
- Thalassemic 25
Phenotypic rate
(b) No, the allele for thalassemia doesn't parade codominance.
Codominance is an inheritance in which both alleles are expressed inversely in the heterozygous existent. In the case of thalassemia, the heterozygous existent has both normal and thalassemic alleles, but only the normal alleles are expressed. The thalassemic alleles are silenced.
This is because the thalassemia allele is a sheepish allele. This means that it's only expressed when present on both clones of the chromosome. However, the normal allele will be expressed and the thalassemic allele will be silenced If the existent has one normal allele and one thalassemia allele.