Abstract:
:Spermatozoa are the most diverse of all animal cells. Variation in size alone is enormous and yet there are still no clear evolutionary explanations that can account for such diversity. The basic genetics of sperm form is also poorly understood, although sperm size is known to have a strong genetic component. Here, using hemiclonal analysis of Drosophila melanogaster, we demonstrate that there is not only a significant additive genetic component contributing to phenotypic variation in sperm length but also a significant environmental effect. Furthermore, the plasticity of sperm size has a significant genetic component to it (a genotype x environment interaction). A genotype x environment interaction could contribute to the maintenance of the substantial genetic variation in this trait and thereby explain the persistent inter-male differences in sperm size seen in numerous taxa. We suggest that the low conditional dependence and high heritability but low evolvability (the coefficient of additive genetic variation) of sperm length is more consistent with a history of stabilizing selection rather than either sexual selection or strong directional selection.
journal_name
J Evol Bioljournal_title
Journal of evolutionary biologyauthors
Morrow EH,Leijon A,Meerupati Adoi
10.1111/j.1420-9101.2008.01585.xsubject
Has Abstractpub_date
2008-11-01 00:00:00pages
1692-702issue
6eissn
1010-061Xissn
1420-9101pii
JEB1585journal_volume
21pub_type
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