The Bombay phenotype occurs because there is a mutation in t…

The Bombay phenotype occurs because there is a mutation in the gene encoding substance H, which is required for antigens A and/or B to attach to red blood cells. So, people with the Bombay mutation, even though they may have the A/B genes, do not have A/B on their red blood cells and are functionally type O (lacking A/B antigens). Which concept does the Bombay substance H gene mutation demonstrate?

If you set up a dihybrid cross between plants with 2 pairs o…

If you set up a dihybrid cross between plants with 2 pairs of contrasting characteristics that are not sex-linked and for which there is independent assortment [tall (D)/dwarf (d) & red flowers (W)/white flowers (w)], where the parents are true breeding [Parent 1 = tall,red (DDWW) Parent 2 = short,white (ddww)], and all of the resulting F1 offspring are tall with red flowers, what proportions of the different possible genotypes would you expect in F2 offspring?