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GENETIC-MAPPING OF FLORAL TRAITS ASSOCIATED WITH REPRODUCTIVE ISOLATION IN MONKEYFLOWERS (MIMULUS)
Title | GENETIC-MAPPING OF FLORAL TRAITS ASSOCIATED WITH REPRODUCTIVE ISOLATION IN MONKEYFLOWERS (MIMULUS) |
Publication Type | Journal Article |
Year of Publication | 1995 |
Authors | Bradshaw, Jr. HD, Wilbert SM, Otto KG, Schemske DW |
Volume | 376 |
Issue | 6543 |
Pagination | - 765 |
Date Published | 1995 |
Abstract | SPECIATION is the process whereby populations acquire sufficient genetic differences to become reproductively isolated(1). Since Darwin
it has been recognized that the tempo and mode of speciation are
greatly influenced by the number and magnitude of genetic changes
required for reproductive isolation(2-6), but detailed genetic studies
have been limited to a few taxa such as Drosophila(7). Genome mapping
techniques now widely adopted in plant(8,9) and animal(10,11) breeding
make it possible to investigate the genetic basis of reproductive
isolating mechanisms in natural populations. Here we use this approach
to map eight floral traits in two sympatric monkeyflower species that
are reproductively isolated owing to pollinator preference by
bumblebees or hummingbirds. For each trait we found at least one
quantitative trait locus accounting for more than 25\% of the
phenotypic variance. This suggests that genes of large effect can
contribute to speciation.
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