In search of the whales' sisters

Article Abstract:

The early divergent lineages, or extinct fossil taxonomic groups, play a key role in identifying which mammals are the closest relatives to cetaceans. An evaluation of all the available morphological and molecular information highlights the long-extinct fossil groups that were split early from extant cetaceans. The inclusion of these divergent lineages of cetaceans and their likely extinct relatives is vital to the topology of the family tree of living artiodactyls and cetaceans. It may now be appropriate to identify compatible aspects of the molecular and morphological data sets.

Whales, Cetacea

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Head start

Article Abstract:

Experiments into the evolution of the vertebrate head are described. The theory that the head is developed using both new and existing gene sequences is discussed.

Vertebrates

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Paying for sex is not easy

Article Abstract:

Explanations of sex in evolution, and debates on the model set out by Doncaster et al, are examined in detail.

Sex (Biology)

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