In a certain species of plant, flowers occur in three colors: blue, pink, and white. A pure-breeding pink plant is mated with a pure-breeding white plant. All of the F1 are blue. When the blue F1 plants are self-crossed, the F2 occurs 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?

a) Bb Ww
b) bb WW
c) bb Ww
d) Bb ww
e) BB ww

The white flower color is homozygous recessive which is determined by the ww genotype. The pink flower color is also homozygous recessive, thus the genotype is bb. The blue color occurs when there is one dominant allele, therefore the genotype is Bb.

The correct option is D

One dominant W allele allows pink or blue color to occur, therefore, the genotype for the white parent is bb ww or homozygous recessive for white and homozygous recessive for pink. bb WW.

"The ratio 9 blue:3 pink:4 white of F2 is the standard dihybrid ratio which signifies that the two genes are assorting independently.

One gene which controls flower color and the other gene which controls the presence of white flowers. The flower color gene has incomplete dominance as pure-breeding blue and pure-breeding white result in blue in F1 offspring.

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