Question

The fruits of brinjal (eggplant) come in purple, violet and white. A cross between plants with a deep purpled fruit and a white fruit produces the following progeny in the $F_2$ generation: 45 deep purple, 90 violet and 45 white brinjal plants
Following are the genetic basis of fruit colour in the brinjal, except

• A. Phenotype of the hybrid is an intermediate between the two homozygous parents
  
• B. Heterozygotes are the blend of homozygous phenotypes
• C. One allele is completely dominant over another
• D. Trait in the heterozygous condition shows a third phenotype, other than parents
  

Answer 1

The correct option is C One allele is completely dominant over another

This is a case of incomplete dominance. After cross between two individual with contrasting traits, the $F_1$ comes up with a different phenotype. And when $F_1$progeny are crossed with each other, the $F_2$ progeny comes in 1:2:1 ratio phenotypically as well as genotypically.
In the given example, the $F_2$generation, $\frac{1}{4}$ are purple (PP), $\frac{2}{4}$ are violet and $\frac{1}{4}$ are white fruit producing plants.