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  • In Antirrhinum two plants with pink flowers were hybridized. The F1 plants produced red, pink and white flowers in the proportion of 1 red, 2 pink and 1 white. What could be the genotype o

In Antirrhinum two plants with pink flowers were hybridized. The F1 plants produced red, pink and white flowers in the proportion of 1 red, 2 pink and 1 white. What could be the genotype of the two plants used for hybridization? Red flower colour is determined by RR, and white by rr genes.

Option: 1

rrrr


Option: 2

RR


Option: 3

Rr


Option: 4

rr


Answers (1)

best_answer

Red (RR) crossed with recessive white (rr) ------> Generation F 1: Rr (pink flowers)

Selfing of F1: Rr x Rr -----> RR (red), Rr (pink) , Rr (pink) and rr (white)This is a sign of incomplete dominance. Incomplete dominance is a form of intermediate inheritance in which one allele for a particular trait is not completely superior to the other. This leads to a third phenotype, where the expressed physical trait is a combination of dominant and recessive phenotypes. The ratio is therefore 1:2:1. Hence, option 3 is correct.

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Gunjita

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