Polygenic traits exhibit $....$.

$A$ 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 $x$?

Which of the following statements is correct about polygenic inheritance?

Flower color in plants is an example of quantitative inheritance,and it is controlled by two pairs of genes. What fraction of plants in the $F_2$ generation will show the parental phenotype?

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

Which scientist demonstrated that skin color in humans exhibits polygenic inheritance?