For providing evidence in favour of semiconservative way of $DNA$ replication; Taylor, Woods and Hughes performed experiments on

Which organism was used by Beadle and Tatum to proposed one gene-one enzyme hypothesis

Mode of $DNA$ replication in E. coli is

The males of grasshoppers and moths posses two sets of autosomes and

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