Could a person inherit homozygous recessive alleles for both alkaptonuria and and phenylketonuria? if so, what would the symptoms be?

The correct answer is "It is possible to inherit homozygous recessive alleles for both alkaptonuria and and phenylketonuria, but only the symptoms of  phenylketonuria will be present".

Explanation:

Alkaptonuria (AKU) and and phenylketonuria (PKU) are two homozygous recessive alleles located at different chromosomal loci, therefore it is possible that a person inherit the two conditions. However, under this condition only the symptoms of  PKU will be present. The PKU would prevent the accumulation of homogentisic or melanic acid, which would remediate the symptoms of AKU.

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b.have there own function.

helicase, i think thats it