Aseed dealer wants to sell four-o'clock seeds that will produce only red, white, or pink flowers. explain how this should be done.

Answer

           Four-O'clock plant (Mirabilis jalapa) follow the phenomenon of co-dominance.

Co-dominance

          Co dominance is a relationship among allele where both allele contribute to the phenotype of heterozygote.

Explanation

           Japanese 4 o clock plats have two types of flower in their parental generation that is red and white. When these parents are crossed a new plant with pink colour is also observed in their F1 generation as shown in cross below.

Parental generation

Phenotype                     Red Flower      x        White Flower

Genotype                           RR                               rr

Gametes                              R, R                             r, r

F1 generation                 Rr, Rr,Rr,RrPink Flower.

Result              

          The allele contributes in the phenotype of flower and pink flowers are produced.

after making a punnet square using bv bv bv bv you will find that the ratio will be 9: 7 or a 128.6% probability.

hope this

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: