NEET 2010 Biology question
In Antirrhinum two plants with pink flowers were hybridized. The F 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.
Answer: (4)
Solution
Flower colour in Antirrhinum shows incomplete dominance: RR is red, Rr is pink and rr is white. A 1 red : 2 pink : 1 white ratio is the typical monohybrid ratio for incomplete dominance, obtained from the cross Rr
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