A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits − blood group A or O − is dominant? Why or why not? Please give a brief description.

Question

Answer

Nope , the information is not enoughif u have s chand bio then see its answer ur doubt will definitely get cleared

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Ohk.but what you don't understand?pls tell me,i can be solve your any problem.

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Thnx to both of u......... :)do we will hv to write the whole process as described in s Chand in xams as well.......  coz mrks are deducted for overwriting

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Bro I had already searched for this question on Google bt didn't find such answer which can make me understand better. Sorry to say bt I don't want answers copied from Google.... hope u don't mind my words.... BTW thnx

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Yes this information is enough to tell which trait is dominant or recessive. we know that blood group O is only present if both are recessive which means ii and it is said that man having blood group A which means it is heterozygous because their daughter is having blood group O. When gametes are formed then one is of blood group O as man is having heterozygous and female has homozyous blood group O.So it is easily observed that blood Group A is dominant and blood group O is recessive.

Answer

Introduction:
In order to determine whether blood group A or O is dominant, we need to understand the inheritance patterns of blood groups. Blood groups are determined by the presence or absence of certain antigens on the surface of red blood cells.

Inheritance of Blood Groups:
- Blood group A individuals have the A antigen on their red blood cells.
- Blood group O individuals do not have either the A or B antigens on their red blood cells.
- Blood group O is considered the recessive trait because it does not have any antigens.

The Punnett Square:
To determine the possible blood types of the offspring, we can use a Punnett square. Since the father has blood group A (AO) and the mother has blood group O (OO), the possible combinations of their alleles are as follows:

Father's alleles: A, O
Mother's alleles: O, O

The Punnett square shows that the possible genotypes of the offspring are AO and OO, and the corresponding blood types are A and O, respectively.

| A | O
---|-------|------
O | AO | OO

Conclusion:
Based on the information provided, we can conclude that blood group A is dominant over blood group O. This is because the daughter has blood group O, which means she inherited the recessive allele from both her parents. If blood group O was dominant, the daughter would have inherited blood group O only if both parents were either blood group O or had at least one O allele.

Explanation:
The inheritance of blood types follows a specific pattern. The A and B alleles are both dominant over the O allele, but they are codominant with each other. This means that if an individual has one A allele and one B allele, their blood type will be AB.

Since the daughter in this case has blood group O, it means that she inherited two O alleles - one from her father and one from her mother. This indicates that the O allele is recessive to both the A and B alleles.

Therefore, we can conclude that blood group A is dominant over blood group O based on the information provided.

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