Simple heredity is the phenotype results from the influence of a single gene.
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It means neither the mother or father have the genes, therefore the child cannot get the gene.
This disease results from a mutation on the x-chromosome. It's recessive considering that a dominant will only cover up things that have occur, for example the damage that has occured, with something else. A recessive will continue to give latent traits. The allele in Adrenoleukodystrophy can only be caused by heredity mutation thus making it recessive.
the separate sentence is a separating sentence
heterozygous recessive
The trait that is hidden is recessive trait.
A 3:1 phenotypic ratio (Mendelian inheritance).