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Sex Determination in Reptiles
  • J. Bull
  • Biology
  • The Quarterly Review of Biology
  • 1 March 1980
Two factors in reptile sex determination have been studied: (1) the presence or absence of heteromorphic sex chromosomes, and (2) the influence of temperature. Recognizable sex chromosomes are commonExpand
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Distinguishing mechanisms for the evolution of co-operation.
The existence of co-operation between species has been cast as a problem to the selfish-gene view of evolution: why does co-operation persist, when it would seem that individual selection shouldExpand
  • 440
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Combining data in phylogenetic analysis.
Systematists have access to multiple sources of character information in phylogenetic analysis. For example, it is not unusual to have nucleotide sequences from several different genes, or to haveExpand
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  • PDF
Chronology and morphology of temperature-dependent sex determination.
Temperature sensitivity and gonadal differentiation were studied in a turtle, Trachemys scripta, with temperature-dependent sex determination. Sex determination was sensitive to both the duration andExpand
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  • M. Bulmer, J. Bull
  • Biology, Medicine
  • Evolution; international journal of organic…
  • 1 January 1982
A species' sex determining mechanism and its sex ratio are inextricably linked. In particular, if a pair of chromosomes determines sex, then the primary sex ratio is controlled by the segregationExpand
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Different trajectories of parallel evolution during viral adaptation.
The molecular basis of adaptation is a major focus of evolutionary biology, yet the dynamic process of adaptation has been explored only piecemeal. Experimental evolution of two bacteriophage linesExpand
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Changes in the heterogametic mechanism of sex determination
SummaryThis paper attempts to explain how the different heterogametic mechanisms of sex determination, such as male and female heterogamety, can arise from a single ancestor. We study this problem byExpand
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Theory of Lethal Mutagenesis for Viruses
ABSTRACT Mutation is the basis of adaptation. Yet, most mutations are detrimental, and elevating mutation rates will impair a population's fitness in the short term. The latter realization has led toExpand
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  • PDF
The sex of many reptiles is determined by the incubation temperature of the egg (Bull, 1980). Laboratory studies of six genera of turtles, for example, show that a developmental temperature of 25 CExpand
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How fundamental are Fisherian sex ratios
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