Sex determination in honey bee
Category: Black Mature
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Many hypotheses attempt to explain why queens of social insects mate multiply. We tested the sex locus hypothesis for the evolution of polyandry in honey bees Apis mellifera. A queen may produce infertile, diploid males that reduce the viability of worker brood and, presumably, adversely affect colony fitness. Polyandry reduces the variance in diploid male production within a colony and may increase queen fitness if there are non-linear costs associated with brood viability, specifically if the relationship between brood viability and colony fitness is concave. We measured the colonies during three stages of their development: 1 colony initiation and growth, 2 winter survival, and 3 spring reproduction. We found significant relationships between brood viability and most colony measures during the growth phase of colonies, but the data were too variable to distinguish significant non-linear effects.
Single locus complementary sex determination in Hymenoptera: an "unintelligent" design?
How honeybees determine sex – BeeTIME
Insectes Sociaux. Using the approach of Mahalanobis it was desclosed that workers of Melipona quadrifasciata are, as far as the external morphology is concerned, closer to males than to queens of this species. A preliminary interpretation of this is given based in a slight modification of the Britten and Davidson hypothesis batteries of genes applied to the sex determination system of these bees. There are two sets of sex genes: one set that acts in the embryo and determines ovary or testis and another that acts in the prepupal stage determining the transformation of the imaginal discs and tegument in adult female or adult male structures. A preliminary hypothesis for gene regulation is proposed for both sets. The place of action of the juvenile hormone in this battery has not yet been experimentally determined, but this working hypothesis put it provisorily in the beginning of the battery. Unable to display preview.
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Sexual Suicide by Honeybees
The order Hymenoptera as a whole has long been known to possess several unusual features intriguing and puzzling to biologists. The most obvious of these is the evolution of social behavior, in which most members of a community sacrifice their own reproductive potential, to provide food and protection for the few reproductive members and their offspring. It is clear from the presence of such unusual life histories that some Hymenopterans have been subject to strong divergent selective pressures which have effected various aspects of their biology. It is perhaps no great surprise, then, to find a great deal of variation in the systems of sex determination.
November 26, Yin and Yang, Venus and Mars, the Moon and the Sun, however you want to describe it, becoming a female or a male can make a big difference in your life, and not just for human beings. Misato O.