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Your search keyword '"Willard, D. E."' showing total 6 results
Start Over Author "Willard, D. E." Publication Year Range More than 50 years ago
6 results on '"Willard, D. E."'

5. Natural selection of parental ability to vary the sex ratio of offspring.

Author

Trivers RL and Willard DE

Subjects
Animals, Artiodactyla, Cattle, Deer, Dogs, Environment, Humans, Mink, Models, Biological, Rats, Reproduction, Swine, Selection, Genetic, Sex Ratio
Abstract

Theory and data suggest that a male in good condition at the end of the period of parental investment is expected to outreproduce a sister in similar condition, while she is expected to outreproduce him if both are in poor condition. Accordingly, natural selection should favor parental ability to adjust the sex ratio of offspring produced according to parental ability to invest. Data from mammals support the model: As maternal condition declines, the adult female tends to produce a lower ratio of males to females.

Published
1973
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6. W. W. Keen's first modern brain case.

Author

WILLARD DE Jr

Subjects
History, 19th Century, History, 20th Century, Brain, Neurosurgery, Neurosurgical Procedures, Skull, Torso
Published
1959

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