. 2021 Apr 30;11(7):jkab149. doi: 10.1093/g3journal/jkab149

Table 2.

Single proto-Y/proto-X chromosome genotype fitness values with different dominance scenarios

	XX	XY	YY
Additive
$s_{i j} > 0$	$1 - s_{i j}$	$1 - 0.5 s_{i j}$	1
$s_{i j} < 0$	1	$1 + 0.5 s_{i j}$	$1 + s_{i j}$
Dominant
$s_{i j} > 0$	$1 - s_{i j}$	1	1
$s_{i j} < 0$	1	$1 + s_{i j}$	$1 + s_{i j}$
Recessive
$s_{i j} > 0$	$1 - s_{i j}$	$1 - s_{i j}$	1
$s_{i j} < 0$	1	1	$1 + s_{i j}$
Overdominant (male only)
$s_{i j} > 0$	$1 - s_{i j}$	1	$1 - s_{i j}$
$s_{i j} < 0$	$1 + s_{i j}$	1	$1 + s_{i j}$

Calculations are shown for determining single chromosome genotype fitness values from the selective effect $s_{i j}$ of proto-Y chromosome $j$ in sex $i$ . Three genotypes are shown (XX, XY, and YY). The Y chromosome could either be Y^M or III^M, and the X chromosome could either be X or III.