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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 selfed, the F₂ plants occur in the ratio 9 blue : 3 pink : 4 white.

- The genotype that produces white is [tex]ww[/tex].
- The presence of one [tex]W[/tex] allele allows pink or blue color to occur.
- The alleles at the hypostatic locus are [tex]B[/tex] (blue) and [tex]b[/tex] (pink).

What is the genotype of the pink parent?

A. [tex]BB\ ww[/tex]
B. [tex]bb\ WW[/tex]
C. [tex]Bb\ ww[/tex]
D. [tex]bb\ ww[/tex]
E. [tex]Bb\ Ww[/tex]

Answer :

The genotype of the pink parent is Bb Ww.

In this genetic scenario, the information provided allows us to deduce the genotypes of the parent plants and their offspring. We know that a pure-breeding pink plant (bb WW) is mated with a pure-breeding white plant (bb ww), resulting in blue F1 offspring (Bb Ww). The presence of one "W" allele allows for the occurrence of either pink or blue color.

When the blue F1 plants (Bb Ww) are selfed, they produce F2 plants in a 9:3:4 ratio, indicating the phenotypic distribution of blue, pink, and white flowers. The genotype that produces white flowers is ww, which is known from the information given.

By process of elimination, we can determine that the genotype of the pink parent must be Bb Ww, as this combination allows for the observed inheritance patterns and ratios in the F2 generation.

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