Results 211 to 220 of about 1,243,825 (262)
Alternative mating pattern in Enoploteuthis chunii is associated with polyandry and male-biased sex ratio. [PDF]
MicroPubl BiolMoriwaki Y +5 more
europepmc +1 more source
Sex Ratio at Birth in Northern Ireland During the COVID-19 Pandemic: A Comparison With Published Data From the Republic of Ireland, England and Wales. [PDF]
Am J Hum BiolMasukume G +4 more
europepmc +1 more source
Mitonuclear effects on sex ratio persist across generations in interpopulation hybrids. [PDF]
J Evol BiolEdmands S +4 more
europepmc +1 more source
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jpme, 1995
Since the introduction of different ovulation induction regimens the incidence of triplet pregnancies increased from a spontaneous rate of about 1:10,000 to the frequency of nearly 1:1000. Sex ratio of trigemini and male/female proportion of the three newborns within the same triplet set is the amazing issue that we attempted to elucidate in the ...
N, Mordel +5 more
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Since the introduction of different ovulation induction regimens the incidence of triplet pregnancies increased from a spontaneous rate of about 1:10,000 to the frequency of nearly 1:1000. Sex ratio of trigemini and male/female proportion of the three newborns within the same triplet set is the amazing issue that we attempted to elucidate in the ...
N, Mordel +5 more
openaire +2 more sources
Genetica, 1970
It is shown that the well known excess of females in anencephalic births is statistically significant when compared with (a) the general population and (b) their normal sibs.
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It is shown that the well known excess of females in anencephalic births is statistically significant when compared with (a) the general population and (b) their normal sibs.
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Journal of Theoretical Biology, 1982
Using precise genetic models, the evolution of the sex ratio in a population in which interactions between siblings exist but these interactions are not symmetrical with respect to the sexes has been studied. Some interesting differences between co-operative and aggressive models have emerged. © 1982.
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Using precise genetic models, the evolution of the sex ratio in a population in which interactions between siblings exist but these interactions are not symmetrical with respect to the sexes has been studied. Some interesting differences between co-operative and aggressive models have emerged. © 1982.
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Sex differences, sex ratios and sex roles
Proceedings of the Royal Society of London. Series B: Biological Sciences, 1994Sexual selection theory predicts that sex roles will be determined by the operational sex ratio (OSR), the sex ratio among individuals searching for mates at any given time. There are two predictions: (i) the sex which is in 'excess' will be the more competitive sex with respect to access to mates; and (ii) the sex of which there is a 'shortage' will ...
I P, Owens, D B, Thompson
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Group sex ratio and sex reversal
Journal of Theoretical Biology, 1980Abstract In hermaphroditic fishes, the initiation of sex reversal by male removal explains the replacement of lost males but does not explain how the number of males in a group may increase. Since numerous species apparently cannot produce primary males, a second means of initiating sex reversal must exist.
Douglas Y. Shapiro, Roger Lubbock
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