Question

Is blood a polygenic trait?

Answer 1

Blood: A polygenic trait

1. A trait that is influenced by two or more genes, such as height or skin tone, is referred to as a polygenic trait.
2. Because multiple genes are involved, polygenic traits do not follow the patterns of Mendelian inheritance.
3. Blood is also a polygenic trait.
4. Polygenic trait includes features such as hair colour, eye colour, skin colour, and blood type.
5. Many polygenic traits that are influenced by the environment are called multifactorial.
6. Because multiple genes are involved, the polygenic trait does not follow the Mendelian law of inheritance.
7. . There are three alleles present for gene I.
8. An individual contains a pair of alleles, which determine the blood type.
9. This gene illustrates another interesting thing that sometimes happens in inheritance: some genes are codominant.
10. Codominant genes are ones in which two alleles, such as A (IA) and B (IB), are both dominant, and a heterozygous genotype (AB) produces a phenotype where both traits are expressed (the A and B glycoproteins).
11. Blood type AB in humans is not a polygenic trait. rather it is a codominance.