The pedigree shown above indicates that Fred and Luke have hemophilia.
A pedigree is a graphical representation that indicates the occurrence of a given phenotypic trait in a group of genetically-related individuals across generations.
In a pedigree, males are represented by square symbols, while females are represented by circle symbols.
The phenotypic feature studied in a family pedigree is represented by colored-filled symbols, while carriers, i.e., heterozygous individuals for the condition being assessed, are represented by half-shaded circles (females) or squares (males).
In conclusion, the pedigree shown above indicates that Fred and Luke have hemophilia.
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