Question

In incomplete dominance

• A. The parental phenotypic traits are completely lost in $F_2$ progeny
  
• B. Dominant allele reflects its own phenotype in highest proportion in the $F_2$ progeny
  
• C. The $F_1$ hybrid expresses a unique visible trait, intermediate of the parental traits.
• D. $F_1$ hybrid phenotype resembles the dominant phenotype
  

Answer 1

The correct option is C The $F_1$ hybrid expresses a unique visible trait, intermediate of the parental traits.

In the case of incomplete dominance, one allele is not completely dominant over another. A cross between homozygous contrasting traits gives rise to a heterozygous phenotype in between the contrasting homozygous phenotypes. Basically heterozygotes are blend of homozygous phenotypes.

For example, a cross between Snapdragon plants of red and white flower colour, results in the production of a pink coloured flowering plant in the $F_1$ generation, and neither of the parental phenotypes get completely masked. And when this F1 progeny is self-fertilized, the parental phenotypes reappear in the $F_2$ generation in a ratio of 1(red): 2(pink): 1(white).