In Snapdragon a cross between true breeding red flower (RR) plants an

1.	In Snapdragon a cross between true breeding red flower (RR) plants and true breeding white flower (rr) plants showed a progeny of plants with all pink flowers.(a) The appearance of pink flowers is not known as blending. Why ? (b) What is the phenomenon known as ?
Answer» (a) R (dominant allele red colour) is not completely dominant over r (recessive allele white colour) / r maintains its originality and reappear in F₂ generation. (b) Incomplete dominance. Detailed Answer : (a) The appearance of pink flowers in snapdragon in F₁ generation is not due to blending of genes Rr which are although together in hybrid, because the parental characters i.e. red and white flowers appear again in F₂ generation without any change. (b) Neither of the two alleles are completely dominant over the other therefore the phenomenon is called as in Incomplete dominance.

In Snapdragon a cross between true breeding red flower (RR) plants and true breeding white flower (rr) plants showed a progeny of plants with all pink flowers.(a) The appearance of pink flowers is not known as blending. Why ? (b) What is the phenomenon known as ?

Answer»

(a) R (dominant allele red colour) is not completely dominant over r (recessive allele white colour) / r maintains its originality and reappear in F₂ generation.

(b) Incomplete dominance.

Detailed Answer :

(a) The appearance of pink flowers in snapdragon in F₁ generation is not due to blending of genes Rr which are although together in hybrid, because the parental characters i.e. red and white flowers appear again in F₂ generation without any change.

(b) Neither of the two alleles are completely dominant over the other therefore the phenomenon is called as in Incomplete dominance.

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