The ABO blood groups in humans are determined by a multiple-allele system in which IA and IB are codominant and are both dominant to IO. A newborn infant is type A. The mother is type O. Possible phenotypes of the father are

The possible phenotypes of the father include type A blood (genotype AA or genotype AO) or type AB blood (genotype AB).

Human blood type is determined by a single gene that has three different alleles: A, B and O.

The A and B alleles are codominant, which means that both alleles are expressed in heterozygous individuals (type AB blood).

On the other hand, A and B alleles are dominant over O allele.

Therefore, individuals who show an AO genotype have a type A phenotype, while individuals who show a BO genotype have a type B phenotype.

In this case, the phenotype of the mother is type O (genotype OO), while the newborn infant is type A (genotype AO), thereby the infant inherited the A allele from the father.

In conclusion, the possible phenotypes of the father include type A blood (genotype AA or genotype AO) or type AB blood (genotype AB).

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The possible genotype of the father will be AA or AO meaning of type A blood

Explanation:

The ABO blood group system can be regarded as the classification of human blood which is determined by the presence or absence of the antigens A and B, which are carried on the surface of the red cells (erythrocytes). An individual may therefore have type A, type B, type O, or type AB blood.

For a mother to be of type O blood, it means her genotype is OO and is inherited in the recessive form. The infant of type A can have a genotype of AO or AA. Thus, the possible genotype of the father will be AA or AO meaning of type A blood

           IO        IO                      IO         IO

IA        IAIO     IAIO         IA      IAIO      IAIO

IA        IAIO     IAIO         IO      IOIO     IOIO

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

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