A man with type AB blood is married to a woman with type O blood. They have two biological children, and one adopted child. The children’s blood types are: A, B, and O. Which child was adopted?

The adopted child is the one with type O blood.  

Explanation:

Available data:

The man´s genotype for blood type is AB (Codominant type of blood) and the woman´s genotype for blood type is OO, as this type of blood is expressed by two recessive alleles.

Cross:

Parental)  AB   x   OO

Gametes) A   B   O   O

Punnet square)      A      B

                        O    AO   BO

                        O    AO   BO

F1) Half of the biological progeny will be AO and the other half BO.  

   There are no possibilities that any of the biological child could be OO. This means that the adopted child´s blood type is O and the biological children´s blood type are A and B.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

b

explanation: