Answer :
A single inherited phenotypic trait that is governed by two or more separate genes is referred to as polygenic inheritance, often referred to as quantitative inheritance.
- The polygenic physical features like height, skin colour, and hair colour as well as the non-visible traits like blood pressure, intellect, autism, and longevity occur on a continuous gradient with numerous variations of quantifiable increments due to the inheritance mode patterns.
- The impact of having numerous alleles should not be confounded with polygenic inheritance.
- When a gene has many alleles, they are all located at the same location on each chromosome.
- Punnet squares can be used to calculate the likelihood that a child would receive a particular trait from each parent, however in practise there may be many distinct genes influencing a single phenotypic trait, making this difficult to prove.
- For instance, there are three separate alleles that regulate the blood types A, B, and O.
- The distribution of phenotypes resulting from polygenic inheritance typically conforms to a normal distribution of probability, with the majority of kids exhibiting an intermediate phenotype of the two parents.
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