Figure Captions
Figure 1. Mean and standard errors for brood sex ratios
for all cross types done. Solid points are parental selection lines
(female-biased selection on left-hand side; male-biased selection lines
on right-hand side); each point represents block by parent/backcross
parent group. Open symbols are results from crosses where n> 5 for each cross type by block combination.
Figure 2. Observed (bars) and expected (points ± SE)
distribution of brood sex ratio (left panel) and expected brood sex
ratio (BSR) distribution (right panel) for parental, F1 and backcross
generations of Tigriopus californicus crosses among male- and
female-bias selection lines. On right panel median and 95% quantile
limits are shown for expected distribution of variance using dashed and
dotted vertical lines, respectively; solid lines indicate observed BSR
variance.
Figure 3. Change in phenotypic variance for brood sex ratio,
measured as standard deviation in qnorm(proportion male) for each
generation during truncation selection for biased brood sex ratios. Data
from (Alexander et al. 2014). Selection lines are: C = control (no
selection), F = female-biased, M = male-biased; standard least-squares
lines of best fit are given for each line with gray shading indicating
95% regions. After generation 7, brood sex ratio (proportion male) was
0.75 for M line, 0.35 for F line and 0.45 for C line; all had brood sex
ratio = 0.51 at generation 1.
Appendix Figure 1 . Schematic of crossing design. Two blocks
were used, each with four female-biased and four male-biased selection
lines. Cells filled with a number indicate we have data for a cross
between these two lines. Only offspring from crosses between selection
line types were carried forward for backcrosses; shaded cells indicate
crosses whose offspring were used in backcrosses. Siblings from F1
crosses were used in backcrosses with 3-4 male- and female-biased
parental lines in the majority of cases.
Appendix Figure 2 . Result of changing prior distribution used
from uninformative (grey line) to informative (black line) (top panel)
on posterior distribution of heritability on the observed scale in sex
of an individual (bottom panel). The informed prior slightly decreases
the width of the posterior distribution (shown in black; grey line is
density for uninformative prior). UP = uninformative prior; IP =
informative prior.