Genes exhibiting multiple effects are known as

Sometimes the separation of twins is incomplete and these are borne attached are remain so even after. Such twins are known as

Gene which suppresses other gene’s activity but does not lie on the same locus is called as

The term 'gene' was coined by

$A$ : Occasionally mammary glands are functional in males and the condition is called gynaecomastia.

$R$ : Decreased testosterone in later life may also lead to gynaecomastia. It is usually due to perturbation of estrogen to androgen ratio.

Number of linkage group in Pisum sativum is