(i) If A is considered to be dominant over O then the following combinations are possible:
Male: AO and Female: 00
A |
O |
|
O |
AO |
00 |
O |
AO |
00 |
(For understanding)
Daughter can be OO and hence have blood group O.
(ii) If O is considered to be dominant over A then the following combinations are possible:
Male: AA and Female: 00 or OA
A |
A |
|
O |
OA |
OA |
O |
OA |
OA |
O |
OA |
OA |
A |
AA |
AA |
(For understanding)
In this case daughter can be OA and hence have blood group O.
Thus from the information given in the question we cannot ascertain which blood group is dominant as in both cases we can see that the that the daughter can have the blood group O.
The variations ensure that the survival of the species as they allow the members of population to adapt to the changing environment and conditions. The species are more suitable to the changed environment . Thus continuity of the species is maintained.
For example, Bacteria variants which can withstand tolerate heat will survive better in a heat wave than variant which cannot heat wave. It proves that creation of variations in a species promote survival.