These are usually illnesses where the gene is located on the sex chromosomes (X-chromosome and Y-chromosome). A female animal has two X-chromosomes, whereas a male animal has only one X-chromosome and one Y-chromosome.
Inheritance for daughters: see other inheritance, either autosomal, recessive or autosomal, dominant.
Below the table for inheritance of male offspring.
| Inheritance X-linked | Parents | Reproductive cells | Offspring | Interpretation breeding | Interpretation veterinarian |
|---|---|---|---|---|---|
| NORMAL SIRE | AA and AY | A/A X A/Y | SONS 100% AY | SONS 100% NORMAL | SONS 100% HEALTHY |
| NORMAL DAM x AFFECTED SIRE |
AA and BY | A/A x B/Y | SONS 100% AY | SONS 100% NORMAL | SONS 100% HEALTHY |
| CARRIER DAM x NORMAL SIRE | AB and AY | A/B x A/Y | SONS 50% AY 50% BY |
SONS 50% CARRIER 50% AFFECTED |
SONS 50% HEALTHY 50% AFFECTED |
| CARRIER DAM x AFFECTED SIRE | AB and BY | A/B x B/Y | SONS 50% AY 50% BY |
SONS 50% CARRIER 50% AFFECTED |
SONS 50% HEALTHY 50% AFFECTED |
| AFFECTED DAM x NORMAL SIRE | BB and AY | B/B x A/Y | SONS 100% BY | SONS 100% AFFECTED | SONS 100% AFFECTED |
| AFFECTED DAM x NORMAL SIR | BB and BY | B/B x B/Y | SONS 100% BY | SONS 100% AFFECTED | SONS 100% AFFECTED |