Abstract
Reproductive isolation occurs between the boll weevil ( Anthonomus grandis grandis) and the thruberia weevil ( Anthonomus grandis thurberiae). The F 1 hybrid males from crosses of some populations are unable to produce sperm which are capable of moving to the spermatheca of the female to which they are mated. Electron micrographs reveal a disrupted pattern of spermatogenesis which probably results in structurally abnormal sperm.
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