Describe incomplete dominance.
When experiments on peas were repeated using other traits in other plants it was found that sometimes the $F_{1}$ had a phenotype that did not resemble either of the two parents and was in between the two.
The inheritance of flower colour in the dog flower (Snapdragon or Antirrhinum sp.) is a good example to understand incomplete dominance.
In a cross between true - breeding red flowered [$RR$] and true - breeding white flowered plants ( $rr$) the $F_{1}[R r]$ was pink.
When the $\mathrm{F}_{1}$ was self pollinated the $\mathrm{F}_{2}$ resulted in the following ratio $1$ [ $RR $] Red : $2[\mathrm{Rr}]$ Pink : $1[\mathrm{rr}]$ White.
Here the genotype ratios were exactly as we would expect in any mendelian monohybrid cross, but the phenotype ratio had changed from the $3: 1$ dominant : recessive ratio.
$'R'$ was not completely dominant over $r$ and this made it possible to distinguish $\mathrm{Rr}$ as pink from $RR$ [red] and $rr$ [white].
When a pink flowered Antirrhinum plant is test crossed, then phenotypic ratio in resulting progenies is
In red - white flowered cross snapdragon / antirrhinum, $F_2$ generation has red, pink and white flowered plants in the ratio of
A plant with red flowers was crossed with another plant with yellow flowers. If $F_1$ showed all flowers orange in colour, explain the inheritance.
In poultry, new comb colour appears by colaboration of two dominant gene is
Geno typic and phenotypic ration in the offspring is $1:2:1$ it explain the principle of