4. Plants heterozygous for a characteristic that determines petal colour were crossed (AB × AB)

Question

The A allele represents a red phenotype, and the B allele represents a white phenotype. Work out the genotypic numbers if:

a. This is an F1 cross. The results will be one AA to two AB to one BB.

b. A and B are incompletely dominant

c. A and B are co-dominant

Answer 1

Yes for the first one the genotypes ratios would be 1:2:1

if A and B are incompletely dominant that means a new “color” in this case pink will be expressed if an A and B (AB) are present. A co-dominant expression would look like both red and white spots present on one flower.