Question $20$

$1\mathrm{.}5$ pts

In a certain species of plant, flowers occur in three colors: blue, pink, and white. A pure$-$breeding pink plant is mated with a purebreeding white plant. All of the $F_1$ are blue. When the blue $F_1$ plants are selfed, the $F_2$ plants occur in the ratio $9$ blue : $3$ pink: $4$ white. The genotype that produces white is ww$.$ The presence of one $W$ allele allows pink or blue color to occur. The alleles at the hypostatic locus are $B($blue$)$ and $b($pink$).$ What is the genotype of the white parent?

bb WW

bb Ww

$BbWw$

Bb ww

BB ww