in a breeding experiment with the "four o'clock" plant, red flowered plants were crossed with plants with white flowers. The parent plants were all pure lines. All the plants from f, generation were pink.

Question

a) what is the genetic explanation for the appearance of pink flowers and the absence of red and white flowers in the f1 generation.
b) workout the genotype of f1 generation.

Answer 1

a) The appearance of pink flowers in the F1 generation is due to incomplete dominance. In incomplete dominance, neither allele is completely dominant over the other, so a blending of the traits occurs. In this case, the red allele and white allele for flower color blend together to produce a pink color in the F1 generation. This also explains why there are no pure red or white flowers in the F1 generation.

b) The genotype of the F1 generation can be represented as Rr, where R represents the allele for red flowers and r represents the allele for white flowers. Since pink is the result of having one allele for red and one allele for white, the genotype of the F1 generation would be heterozygous (Rr).