Question

when is meant by the phrase \a trait has incomplete dominance\?
that the phenotype of heterozygote is an intermediate between that of both homozygous phenotypes
that the phenotypes of all genotypes are identical
that there are no dominant alleles in the population
that the phenotype of homozygous dominants is the same as that of homozygous recessives
that the phenotype of homozygous dominants is the same as that of heterozygotes

Explanation:

Incomplete dominance refers to a genetic scenario where the heterozygous genotype produces a phenotype that is a blend or intermediate of the phenotypes expressed by the two homozygous genotypes (homozygous dominant and homozygous recessive). This distinguishes it from complete dominance, where the heterozygote shows the same phenotype as the homozygous dominant. The other options are incorrect: identical phenotypes for all genotypes (option 2) is not dominance; no dominant alleles (option 3) is not the definition; same phenotype for homozygous dominants and recessives (option 4) is not possible; same phenotype for homozygous dominants and heterozygotes (option 5) describes complete dominance.

Answer:

that the phenotype of heterozygote is an intermediate between that of both homozygous phenotypes