In humans chromosomal condition of male is
$44\ AA + XO$
$44\ AA + XX$
$44\ AA + XY$
$44\ AA + XXY$
The contribution of cytoplasmic $DNA$ in cells to total $DNA$ is
A pure breeding pea plant with the dominant phenotype of character $A$ and recessive phenotype of character $B$ was crossed with another pure breeding plant with the recessive phenotype of $A$ and dominant phenotype of character $B. A$ offspring of this cross was crossed with a homozygous recessive for both the characters -$A$ and $B$. The following results are obtained $22$ were phenotypically dominant for $A$ and recessive for $B$.
$4$ were phenotypically dominant for both $A$ and $B$.
$4$ were phenotypically recessive for both $A$ and $B$.
$24$ were phenotypically recessive for $A$ and dominant for $B$.
These results show that
The pairing of bivalent synapsis occur in