Question

How would the heterozygote phenotype of a partially dominant genotype differ from that of a fully dominant genotype?

a) Partially dominant: exhibits an intermediate phenotype between the homozygous genotypes; fully dominant: resembles one of the homozygous genotypes.
b) Partially dominant: shows a phenotype identical to the recessive genotype; fully dominant: displays the phenotype of the dominant genotype.
c) Partially dominant: showcases a phenotype similar to the dominant genotype; fully dominant: demonstrates a phenotype similar to the recessive genotype.
d) Partially dominant: presents a phenotype identical to the dominant genotype; fully dominant: shows an intermediate phenotype between the homozygous genotypes.

Answer 1

The phenotype of a heterozygote in partial dominance (incomplete dominance) shows an intermediate trait between two homozygous phenotypes (e.g., pink flowers from a cross of red and white snapdragons), whereas in complete dominance, the heterozygote phenotype is the same as the homozygous dominant phenotype (e.g., a tall pea plant regardless of whether it's TT or Tt).

Step-by-step explanation:

The phenotype of a heterozygote in a partially dominant genotype exhibits an intermediate characteristic between the two homozygous phenotypes. This is known as incomplete dominance, where neither allele is completely dominant over the other. For instance, if we consider flower color in snapdragons, a cross between a red-flowered plant (CRCR) and a white-flowered plant (CWCW) would result in offspring with pink flowers (CRCW), which is the intermediate phenotype. Conversely, in the case of complete dominance, the heterozygote phenotype will be similar to the homozygous dominant phenotype; for example, a pea plant with the genotype Tt (heterozygous) will still exhibit the tall phenotype, which is the same as a TT (homozygous dominant) pea plant.