Question

The inheritance of flower color in Antirrhinum (dog flower) is an example of
(a)incomplete dominance
(b)codominance
(c)multiple alleles
(d)linkage

Answer 1

Hint: The type of inheritance that is shown in the flower Antirrhinum is when neither of the two of the alleles present for a particular genetic trait has complete dominance over the expression of the particular trait. The trade which is hence expressed is different from either of the parents.

Complete answer:
Antirrhinum is a flowering plant species that has gained a local name as Snapdragon. The local name originates from a characteristic of the flower in which the fruit of the flower when squeezed the flower’s mouth snaps open like that of the mouth of a dragon. There is the presence of two types of flower color state, viz., Pure white and pure red. There are two alleles also which control the expression of the flower color. The cross when done between two plants some hybrid plants are also produced and those generations are produced with a flower color of pink. These pink color flowers are unlike any of the parents and hence show the occurrence of incomplete dominance. Hence, due to this incomplete dominance, except for the two phenotypes of red and white an introduction to the third form of type that is pink is also done.

Additional Information: -This flower is mainly used as an ornamental plant and sometimes it also sees usage as a cut flower.
-This flower is perennial but it is why cultivation is cultivated in the form of an annual plant.
-Incomplete dominance results in the expression of another type of trait which is not present in either of the parents.
-The effect of incomplete dominance can only be seen in heterozygous condition. When the flower is heterozygous, the expression of the dominant and recessive alleles occurs partially and hence no allele can have complete dominance.
-Co-dominance is also a special form of incomplete dominance but here the two alleles which are controlling a particular trait are expressed in a uniform manner, that is they have a 50% contribution in the expression of traits.
So, the correct option is,” incomplete dominance”.

Note: -The proof of incomplete dominance and codominance is given in the cross that Mendel had performed earlier with the pea plants.
-Some other types of incomplete dominance can also be seen in the Andalusian fowl in which the expression of the same can be seen in the trait of feather color.