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|
Male |
Female |
|||||
|---|---|---|---|---|---|---|
| Genotype | Expression | Fitness | Genotype | Expression | Fitness | |
| Male heterogamety (XY) | R | zm |  |
RR | zf |  |
| RM | zf+δf |  |
||||
| M | zm+δm |  |
MM | zf+2δf |  |
|
| Female heterogamety (ZW) | RR | zm |  |
R | zf |  |
| RM | zm+δm |  |
||||
| MM | zm+2δm |  |
M | zf+δf |  |
|
The resident allele (R) has expression level zm in males and zf in females. The mutant allele (M) causes a small quantitative shift of δm and δf in males and females, respectively.
