Question

what type of inheritance is exhibited by the trees of different heights?
parent
brown dog
tall tree
spiked hair
offspring
brown dog and white spots
medium tree
spiked and curly hair
parent
white dog
short tree
curly hair
(i)
(ii)
(iii)
a incomplete dominance
b codominance
c both
d

Explanation:

• Incomplete dominance occurs when the phenotype of the offspring is a blend of the phenotypes of the parents. For example, in the case of the trees, a tall tree (one parent) and a short tree (another parent) produce a medium - height tree (offspring), which is a blend.
• Codominance is when both alleles are expressed simultaneously in the offspring. For instance, in the dog example, a brown dog and a white dog have an offspring with both brown and white spots (both parental traits are expressed). But the question is about the trees.
• Since the tree height example shows a blending of traits (tall and short parents give a medium - height offspring), it is an example of incomplete dominance.

Answer:

a. Incomplete dominance