Aperson with blood group a produces antibodies against b. a person with blood group b produces antibodies against a. a person with blood group ab produces no antibodies. how can you explain this? a and b alleles are co-dominant. therefore, both a and b carbohydrates are present on the cell. a is incompletely dominant over b. both a and b carbohydrates are present on the cell. a and b alleles are co-dominant. half the cells have only a, and other half have only b.

I think the correct answer from the choices listed above is option A. From the situation stated above we can say that A and B alleles are co-dominant. Therefore, both A and B carbohydrates are present on the cell. Hope this answers the question. 

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.