Suppose meiotic drive affects both pollen and ovules and that 80% of the pollen grains and ovules from a heterozygote carry the A allele. What fraction of offspring from a selfing heterozygote will be heterozygous?
One force that can alter the ratio of heterozygotes produced by a selfing heterozygote is meiotic drive. This means that one allele, say A, pushes its way into more than half of the gametes (ovules or pollen).