When closely placed genes on the same chromosome are inherited together,the phenomenon is known as:

The term "linkage" was coined by

$A$ : In block inheritance of all genes located on the same chromosome may occur in some organisms.
$R$ : Dihybrid test cross will have only two phenotypes.

Which one of the following pairs is correctly matched?

When a cluster of genes shows linkage behaviour,they:

Two genes $R$ and $Y$ are located very close on the chromosomal linkage map of maize plant. When $RRYY$ and $rryy$ genotypes are hybridized,then $F_{2}$-segregation will show