**Introduction:**
In order to determine whether blood group A or O is dominant, we need to understand the basic principles of inheritance and the patterns of inheritance for blood types. Blood types are determined by the presence or absence of certain antigens on the surface of red blood cells. There are four major blood types: A, B, AB, and O. Each blood type is determined by the combination of two alleles inherited from the parents.

**Understanding Inheritance:**
- Each individual has two copies of the gene responsible for determining blood type. One copy is inherited from the father, and the other copy is inherited from the mother.
- There are three possible alleles for blood type: A, B, and O. The A and B alleles are dominant, while the O allele is recessive.
- An individual with blood type A can have either two A alleles (AA) or one A allele and one O allele (AO).
- An individual with blood type O has two O alleles (OO).
- An individual with blood type O can only pass on the O allele to their offspring, as they do not possess any A or B alleles.

**Analysis of the Given Scenario:**
- The man has blood type A, which means he must have either two A alleles (AA) or one A allele and one O allele (AO).
- The woman has blood type O, which means she must have two O alleles (OO).
- Their daughter has blood type O, which means she must have inherited the O allele from both parents.

**Conclusion:**
Based on the information provided, we can conclude that blood type O is recessive and blood type A is dominant. This is because the daughter only has blood type O, which means she inherited the O allele from both parents. If blood type A were dominant, the daughter would have inherited at least one A allele from her father and would have blood type A or AB.

Therefore, the information provided is enough to determine that blood type A is dominant and blood type O is recessive.

Not enough