Characterization of a tyrosine kinase-peptidase A synteny in linkage group XIII of Xiphophorus fishes (Teleostei: Poeciliidae): implications for vertebrate chromosome evolution

Article Abstract:

Spontaneous and induced tumor models have been developed to explain interspecies hybrids of Xiphophorus fishes. The models have been used to evaluate tyrosine kinase-related Xiphophorus sequences and their relation to tumorigenesis. The linkage of Xiphophorus src-related sequence and linkage group XIII described an ancestral vertebrate gene arrangement. Thus, the src gene may have evolved from chromosome duplications.

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Strong Reproductive Skew Among Males in the Multiply Mated Swordtail Xiphophorus multilineatus (Teleostei)

Article Abstract:

Research on the Xiphophorus swordtail fish mating system indicates that a single male typically dominates, contributing over 70% to offspring, with other males not appearing to be especially effective. Postcopulatory processes including sperm competition are also discussed.

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Maternal Effects on Encystment in Crosses Between Two Geographic Strains of Artemia franciscana

Article Abstract:

Research on two populations of the branchiopod Artemia franciscana shows maternal effects in proportion of encysted broods, and paternal and grandfather effects in number of encysted offspring averages per brood.

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