PATHOLOGY

Detailed explanation-1: -In snapdragon i.e. Antirrhinum majus, the flower color is controlled by incomplete dominance. The snapdragon flower has two flower colours, red (RR) and white (rr). When cross-pollination occurs between red and white flowers, a pink (Rr) snapdragon flower is produced.

Detailed explanation-2: -The Rr genotype shows the phenotype of pink flowers and the rr genotypic character shows the phenotype of white flower. This means that all the plants which are present as the progeny have the genotype as Rr. Therefore % of Genotype Rr is 100% here. The % of Phenotype is 100% for pink flowers in the progeny.

Detailed explanation-3: -This is called as incomplete dominance. For example, flower colour in Mirabilis jalapa (Snapdragon). The red flower is the dominant character and the white flower is recessive character. There is blending of the two alleles.

Detailed explanation-4: -In snapdragon, a cross between true breeding red flowers (RR) and true breeding white flowers (rr) showed offspring with pink flowers: The appearnce of pink flowers is not known as blending. Why ? In Snapdragon F1 progeny shows pink coloured flowers when a cross in made between red flowered and white flowered plants.

Detailed explanation-5: -A red snapdragon flower is crossed with a white snapdragon flower, and all the resulting flowers from the cross are pink.