- Alleles that are carried on the X chromosome are described at sex-linked.
- Any recessive genes that are carried on a male's X chromosome will not have a normal X chromosome to prevent them from being effective, as they instead have a Y chromosome that contains few genes.
- Therefore the recessive gene is unpaired and there is no dominant gene present.
- This is known as sex-linkage.
- The gene cannot be passed from a male to his sons.
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