Question

what is an example of codominance?
a blood type o
b a flower with red and white petals that results from the cross of a plant with red petals with a plant with white petals
c a flower with pink petals that results from the cross of a plant with red petals with a plant with white petals
d skin color

Explanation:

Codominance is a genetic phenomenon where both alleles in a heterozygote are fully expressed. In the case of blood type O, it is a result of recessive alleles (not codominance). Skin color is an example of polygenic inheritance. A flower with pink petals from red and white - petaled parents is an example of incomplete dominance (where the phenotype is an intermediate). However, a flower with red and white petals (both colors clearly visible) from red - and white - petaled parents shows that both alleles (for red and white color) are expressed, which is codominance.

Answer:

B. A flower with red and white petals that results from the cross of a plant with red petals with a plant with white petals