Figure 2. Sex ratios of offspring groups generated by repeated single pair crossings show close correlation.

Nineteen randomly selected breeding pairs were crossed twice; eighteen of them are shown here. The high R² value indicates that sex ratios between 1st and 2nd crosses from the same breeding pair are very similar. Red circles indicate pairs producing offspring with female-biased sex ratio, orange diamond labels the pairs with unbiased sex ratio, whereas blue squares indicate pairs producing offspring with male-biased sex ratio.