The evolution of sperm polymorphism in the drosophila group
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Seminal fluid-mediated fitness traits in Drosophila | Heredity
Sperm heteromorphism is the simultaneous production of two or more distinguishable types of sperm by a single male. Sperm heteromorphism is also called sperm polymorphism or sperm dimorphism for species with two sperm types. Typically, only one sperm type is capable of fertilizing eggs. Fertile types have been called "eusperm" or "eupyrene sperm" and infertile types "parasperm" or "apyrene sperm".
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That closely related species often differ by chromosomal inversions was discovered by Sturtevant and Plunkett in Our knowledge of how these inversions originate is still very limited, although a prevailing view is that they are facilitated by ectopic recombination events between inverted repetitive sequences. The availability of genome sequences of related species now allows us to study in detail the mechanisms that generate interspecific inversions.
Try out PMC Labs and tell us what you think. Learn More. It is widely established that proteins involved in reproduction diverge between species more quickly than other proteins. Here, we derive the expected levels of gene diversity within populations and divergence between them for male sperm protein genes evolving by post-copulatory, pre-zygotic fertility competition, i.
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