'Functional' haplodiploidy
Article Abstract:
Cyclodiene resistance in coffee berry borers (Hypothenemus hampei) is sex-linked. Male borers are unable to pass the resistance on to their offspring, a characteristics of true haploids though both the paternal and maternal chromosomes exist, making the male borers diploid. However, in the male soma, one of the sets of chromosomes is compacted into a darkly straining ball of chromatin. During the first meiotic divisions, the paternally derived set degenerates while the maternally derived set condenses and divides, making the males functionally haploid despite having both chromosome sets.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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A point mutation in a Drosophila GABA receptor confers insecticide resistance
Article Abstract:
The major inhibitory neurotransmitter in vertebrates and invertebrates is GABA (y-aminobutyric acid). The GABA A receptors function as heteromultimers in vertebrates, forming an integral chloride ion channel for drugs and pesticides and in seizure-related diseases. The GABA A receptor antagonists that displace each other are picrotoxinin (PTX) and cyclodiene insecticides. A study examines the resistance-associated point mutation, identifies a single amino acid which gives the GABA receptor high resistance to PTX and cyclodienes and shows the resistance power of insecticides.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Insecticide resistance in mosquito vectors
Article Abstract:
Insecticide resistance in mosquito vectors for malaria and West Nile virus is due to the frequent loss of sensitivity of the insect acetylcholinesterase enzyme to organophosphates and carbamates. A study revealed that this insensitivity results from a single amino-acid substitution in the enzyme.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2003
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