The following possibilities which could explain the presence of the hemophilia allele in her genotype is that either her mother was a carrier or her father had hemophilia and is therefore denoted as option D.
This is referred to as the genetic constituent or constituent of an organism and contributes to the phenotypic traits.
Recessive traits are the one that is only expressed when an organism has two recessive alleles for that trait. This therefore means that it is either her mother was a carrier or her father had it which results in it having two different alleles.
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