SEX-RATIO EVOLUTION IN SEX CHANGING ANIMALS

Sex-ratio evolution in sex changing animals.

Sex allocation theory is often able to make clear predictions about when individuals should facultatively adjust their offspring sex ratio (proportion male) in response to local conditions, but not the consequences for the overall population sex ratio. A notable exception to this is in sex changing organisms, where theory predicts that: (1) organisms should have a sex ratio biased toward the "f...

Anencephalus: a changing sex ratio.

The sex ratio of infants born with certain congenital abnormalities diverges widely from unity. There is evidence that these sex ratios vary from place to place and in different races (Gittlesohn and Milham, 1962; Emanuel, 1972). Stocks (1970) has shown that within 25 countries of largely European stock there is a close positive correlation between the divergence of the sex ratio of congenital ...

The Evolution of Sex Determination in Animals

Evolution of the Breeding Sex Ratio under Partial Sex Change.

ZIMMER, E. A., AND K. J. NEWTON. 1982. A simple method for the isolation of high molecular weight DNA from individual maize seedlings and tissues, pp, 165-168. In W. F. Sheridan (ed.), Maize for Biological Research. Plant Molecular Biology Assoc., Charlottesville, VA. ZIMMER, E. A., E. R. lUPE,AND V. E. WALBOT. 1988. Ribosomal gene structure, variation and inheritance in maize and its ancestors...

Theoretical studies on sex ratio evolution.

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