A trade-off-invariant life-history rule for optimal offspring size

Article Abstract:

A new evolutionary ecology model generates the optimal offspring size without consideration of specific trade-offs but rather a numerical basis. Life history evolution appears to follow a universal -1 inverse proportionality exponent between litter size and offspring size as well as survival. The model is based on the largest offspring compared to the available resources and number of siblings. Though the -1 exponent does not change, the proportionality constant varies between higher taxa species such as when reptiles are compared to mammals.

Environmental aspects, Mathematical optimization, Optimization theory

---

Creatures from another world

Article Abstract:

Genetic experiments were undertaken by Lenski and colleagues using digital organisms created in a computer. The results are claimed to support the idea that complex interactions between multiple mutations are a general feature of genetic systems. The experiments change parameters and have advantages over the conventional biologist, with all relevant data recorded without error. Selective pressures were manipulated so that simple and complex digital organisms evolved.

---

Hox genes, fin folds and symmetry

Article Abstract:

There is no evidence that the pelvic limb evolved before the pectoral limb, and considerable evidence for the reverse, possibly due to phylogenetic recapitulation. C. Tabin and E. Laufer do not adequately explain the fin-folding mechanism. The transition from fin fold to a secondary axis may have several explanations. Not enough is known about expression of the Hox gene, and it needs further study.

Genetic regulation

Similar abstracts:

• Abstracts: An aerial sightability model for estimating ferruginous hawk population size. Sex-specific bias in helicopter surveys of elk: sightability and dispersion effects
• Abstracts: Altered circadian activity rhythms and sleep in mice devoid of prion protein. Language rhythms in baby hand movements
• Abstracts: Structure of a 14-3-3 protein and implications for coordination of multiple signalling pathways. The role of turns in the structure of an alpha-helical protein
• Abstracts: Infiltration of mariner elements. Transposons hop out of maize. Transposon tagging of a male sterility gene in Arabidopsis
• Abstracts: A stellar origin for the short-lived nuclides in the early Solar System. Observations of high-velocity, weakly shocked ejecta from experimental impacts

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.