ABO blood type is controlled by one gene on chromosome 9. There are three alleles, A, B, and i. A and B are dominant over i. A and B are codominant. The phenotype for a h-o-m-o-z-y-g-o-u-s recessive individual is blood type O. One parent has blood type O, and the other has the genotype Bi. What is the chance that they have a child that is blood type B?

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.