A cross in which an organism showing a dominant phenotype in crossed with the recessive parent in order to know its genotype is called -

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 -

The 3'-5' phosphodiester linkages inside a polynucleotide chain serve to join -

The lac Operon consists of -