By S. C. Stearns (auth.), Stephen C. Stearns (eds.)
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Additional info for The Evolution of Sex and its Consequences
Karyogamy 3) Fertilization a. Exposure to risk b. Minimal density for reproduction II. Costs derived from anisogamy 1) Genome dilution (cost of males) 2) Sexual selection a. Sexual competition (conflict, exposure) b. Dual phenotypic specialization A second type of cost not derived from anisogamy has been called the cellular-mechanical cost of sex (Lewis, 1983). This includes any loss of synthetic potential in cells as a result of delays caused by the movement of supramolecular bodies such as chromosomes or gametic nuclei.
Inventory of the costs of sex I. Costs not derived from anisogamy 1) Recombination 2) Cellular-Mechanical costs a. Meiosis b. Syngamy c. Karyogamy 3) Fertilization a. Exposure to risk b. Minimal density for reproduction II. Costs derived from anisogamy 1) Genome dilution (cost of males) 2) Sexual selection a. Sexual competition (conflict, exposure) b. Dual phenotypic specialization A second type of cost not derived from anisogamy has been called the cellular-mechanical cost of sex (Lewis, 1983).
An important role for 36 group advantages has not been demonstrated, and any such demonstration would be difficult because it would have to be historical. In contrast, some empirical evidence suggests a sustained individual advantage for sex, even among organisms of relatively low fecundity. Most persuasive is the persistence of sources of genetic variation that are known to be responsive to individual selection. Both crossing-over and the division of the genome into multiple chromosomes contribute to genetic variation among progeny, and both are responsive to selection.
The Evolution of Sex and its Consequences by S. C. Stearns (auth.), Stephen C. Stearns (eds.)