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(B) : Polygenic (or quantitative) inheritance is a type of inheritance in which the expression of a trait is controlled by two or more genes. In this,

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polygenic inheritance

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(B) : Polygenic (or quantitative) inheritance is a type of inheritance in which the expression of a trait is controlled by two or more genes. In this,each dominant allele contributes a unit fraction to the trait,and the total phenotypic expression is the cumulative effect of all dominant alleles of the polygenes.Human skin colour is a classic example of polygenic inheritance,controlled by three pairs of genes: $A, B$,and $C$.Dark skin colour (Negro) results from the presence of all six dominant alleles $(AABBCC)$.Very light or white skin colour results from the presence of all six recessive alleles $(aabbcc)$.

Inheritance of skin colour in humans is an example of

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The inheritance of human skin color is an example of ........

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Which one of the following pairs of features is a good example of polygenic inheritance?

$A$ polygenic trait is controlled by $3$ genes $A, B$,and $C$. In a cross $AaBbCc \times AaBbCc$,the phenotypic ratio of the offspring is observed as $1:6:x:20:x:6:1$. What is the possible value of $x$?

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