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Of or relating to a system of sexual determination in which diploid females develop from fertilized eggs and haploid males develop from unfertilized eggs, as in most hymenopterans, such as ants and bees, and certain other invertebrates.
A haplodiploid organism or species.

[From Greek haploos, single; see haploid + diploos, double; see diploid + -oid.]

hap′lo·dip′loi′dy (-loi′dē) n.
References in periodicals archive ?
Crespi BJ, Vanderkist BA (1997) Fluctuating asymmetry in vestigial and functional traits of a haplodiploid insect.
MATESOFT: a program for deducing parental genotypes and estimating mating system statistics in haplodiploid species.
Cytonuclear theory for haplodiploid species and x-linked genes.
Host genotype determines cytoplasmic incompatibility type in the haplodiploid genus Nasonia.
If Blochmannia is similarly involved in manipulating ant reproduction and sex ratios toward females, it would in part share this "preference" with colony workers, who are also favored to manipulate sex ratios owing to relatedness asymmetries under haplodiploid genetics.
Eusociality is relatively rare in nature, and the traditional view has been that a haplodiploid reproductive pattern provides a genetic facilitator.
Male-killing bacteria have been observed in male heterogametic, female heterogametic, and haplodiploid hosts.
Because of the haplodiploid genetic system (where females are diploid and develop from fertilized eggs, while males are haploid and develop from unfertilized eggs), a worker is less related to her own daughters (r = 1/2) than to her full sisters (r = 3/4; Hamilton 1964).
Coefficients of relatedness in a social insect colony containing a queen and her progeny reveal asymmetries that result from the haplodiploid sex determination system of Hymenopterans.
Other studies have not examined the genetics of resistance in a functional haplodiploid, says Richard W.
reproductive parasites like Wolbachia can induce a male-biased sex ratio in haplodiploid species as a consequence of cytoplasmic incompatibility (Breeuwer & Werren 1990; breeuwer & Jacobs 1996).