Between Zeus and the Salmon The Biodemography of Longevity (1997) / Chapter Skim
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Glossary
Glossary
Pages 269-274
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From page 269... ...
Multiple gene effects, such that alleles that improve fitness in early life have detrimental effects later in life Apoptosis. Programmed death of cells during embryogenesis and metamorphosis or during cell turnover in adult tissues Chromosome.
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From page 270... ...
Connective tissue cell that can differentiate into other blastic cells to form fibrous tissues; a fiber-producing cell widely distributed in tissues Fitness. The ability of a genotype to reproduce its alleles in a particular environment or after some environmental change Free radical.
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From page 271... ...
The egg or sperm cell Gompertz model. Class of statistical models first proposed by the nineteenthcentury British actuary Benjamin Gompertz, in which the hazard rate for death rises exponentially with increasing age of the organism (at least after an initial period of high risk of mortality in infancy and much lower risk in late childhood and adolescence)
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From page 272... ...
Two consecutive special cell divisions in the developing germ cells characterized by the pairing and segregation of homologous chromosomes; the resulting gametes will have reduced, or haploid, chromosome sets Mortality trajectory. Plot of death rate against age group over time Niche.
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From page 273... ...
Any body cell except a germ cell Speciation. The splitting of a phyletic line; the process of the multiplication of species; the origin of discontinuities between populations caused by the development of reproductive isolating mechanisms Stochastic.
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From page 274... ...
The allele that is most frequent in natural populations, often indicated by the symbol +; this term cannot be applied for a locus that has undergone mutation Zygote. The cell resulting from the union of a male and female gamete until it divides; the fertilized ovum
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