Traits controlled by genes located on autosomes are said to be

Match the terms in Column-$I$ with their descriptions in Column-$II$ and select the correct option.

Column-$I$	Column-$II$
$(A)$ Dominance	$(1)$ Many genes govern a single character.
$(B)$ Co-dominance	$(2)$ In a heterozygous organism, only one allele expresses itself.
$(C)$ Pleiotropy	$(3)$ In a heterozygous organism, both alleles express themselves fully.
$(D)$ Polygenic inheritance	$(4)$ $A$ single gene influences many characters.

The inheritance of $ABO$ blood group is an example of which of the following conditions?
$I -$ Complete dominance,$\quad II -$ Co-dominance
$III -$ Multiple allelism,$\quad IV -$ Incomplete dominance

$A$: Pseudoalleles are actually closely linked genes.
$R$: These can be identified easily as both affect different characters,providing separate phenotypes.

Drosophila flies with one half of the body male and the other half female are referred to as:

Statement $A:$ Every species has a unique genetic makeup.
Statement $R:$ There is genetic variation in reproduction among all animals.