Question

What are the two alleles for flower color in snapdragon?​

Answer 1

Answer:

In snapdragons, the color of the flower is controlled by incomplete dominance. The two alleles are red and white

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Answer 2

Answer:

Two alleles for flower colour in snapdragon are red (R) and white (R’/r).    

Explanation:

• In snapdragon/ dog flower, the two alternative forms of flower colour trait are red (R) and white (R’/r).

• In snapdragon (Antirrhinum majus), there exist two traits for flower colour in its pure state i.e. red flower is governed by the dominant trait while the white flower is governed by a recessive trait, hence the blending of two alleles.

• When a true-breeding (pure) homozygous red-coloured plant is crossed with a true-breeding homozygous white-coloured plant, all the F₁ offsprings are found to be heterogeneous pink.

• When the F₁ hybrid offsprings are selfed, they yield three types of offsprings in F₂ which are Red (RR), pink (Rr) and white (rr) in the ratio 1:2:1.

• Since the heterozygotes show an intermediate phenotype due to the blending of dominant and recessive traits, this type of inheritance is called incomplete dominance.

Therefore the Two alleles for flower colour are red (R) and white (r).  

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