But there are also organisms in which the heterozygous sex is the female : birds and butterflies and the law is followed in these organisms.
2.
A study on hybrid mice which investigated the possible causes for hybrid growth disorders revealed heterozygous sex, as expected by Haldane's rule.
3.
Haldane proposed that the stability of hybrid individual development requires the full gene complement of each parent species, so that the hybrid of the heterozygous sex is unbalanced ( i . e . missing at least one chromosome from each of the parental species ).
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