Results 331 to 340 of about 15,924,749 (378)

Sex Liability to Single Structural Defects

Archives of Pediatrics & Adolescent Medicine, 1978
Forty-two of 52 single, localized defects of morphogenesis showed a nonrandom predeliction to one sex. For some of these malformations, the sex liability may be explained on the basis of normal anatomic or hormonal differences between the sexes. For example, the male excess of "prune belly" or triad syndrome is considered due to the fact that most ...
J, Fernando, P, Arena, D W, Smith
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Sex and Social Structure

Science, 2009
Behavioral ecologists are discovering that social roles in bees may recapitulate the reproductive life cycle of solitary females.
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A sex-structured delayed recruitment model

Mathematical Biosciences, 1996
A delay-difference model for a sex-structured population with delayed recruitment is presented. Constant-effort harvesting is introduced for examining the model's sensitivity to harvesting. Linear analyses about the steady states are performed under various parameter choices.
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Mammalian Sex Chromosome Structure, Gene Content, and Function in Male Fertility.

Annual Review of Animal Biosciences, 2019
Mammalian sex chromosomes evolved from an ordinary pair of autosomes. The X chromosome is highly conserved, whereas the Y chromosome varies among species in size, structure, and gene content.
Wan-Sheng Liu
semanticscholar   +1 more source

Sex ratios in geographically structured populations

Trends in Ecology & Evolution, 1986
In his book on sexual selection (1), Darwin documented evidence that the primary sex ratio (the proportion of males at conception) is about 1/2 in a wide variety of species. Otherwise, he explained, a newly conceived member of the rare sex will, on average, have more offspring than one of the common sex, since each offspring has one mother and one ...
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Plant sex chromosomes: molecular structure and function

Cytogenetic and Genome Research, 2008
Recent molecular and genomic studies carried out in a number of model dioecious plant species, including <i>Asparagus officinalis</i>, <i>Carica papaya</i>, <i>Silene latifolia</i>, <i>Rumex acetosa </i>and <i>Marchantia polymorpha</i>, have shed light on the molecular structure of both ...
M, Jamilena, B, Mariotti, S, Manzano
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Attitudes, Cognitive Structures and Emotional Reactivity to Sex and Security: Sex Differences

Psychological Reports, 1974
An attempt was made to determine if sex differences existed for attitudes, cognitive structures, and emotional reactivity for concepts of sex and security and for stimuli. It was hypothesized that for males, the concept of sex and/or sexual stimuli will be ranked higher, elicit a stronger physiological response, elicit a greater number of responses in
R S, Cimbalo, P A, Anzelone, P A, Ryan, M P, Younkers   +3 more
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The structuring of Vicarious Sex

Deviant Behavior, 1996
This paper proposes a change in the typing of a form of sexual deviance: voyeurism (watching persons who are undressing, undressed, or in the act of sexual intercourse). The analysis focuses on a suggested change in what is thought to prompt voyeurism. Voyeurism is presently regarded as pathological deviance by some researchers.
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Cerebral Asymmetry and the Effects of Sex and Handedness on Brain Structure: A Voxel-Based Morphometric Analysis of 465 Normal Adult Human Brains

NeuroImage, 2001
We used voxel-based morphometry (VBM) to examine human brain asymmetry and the effects of sex and handedness on brain structure in 465 normal adults.
C. Good, I. Johnsrude, J. Ashburner, R. Henson, Karl J. Friston, Richard S. J. Frackowiak   +5 more
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Agonistic Structure Differentiated by Sex

2012
The organization of characters into eight sets forms an implicit empirical hypothesis—the hypothesis that agonistic structure, differentiated by sex, is a fundamental shaping feature in the organization of characters in the novels. We predicted (1) that each of the eight character sets would be sharply defined by a distinct and integrated array of ...
Joseph Carroll, Jonathan Gottschall, John A. Johnson, Daniel J. Kruger   +3 more
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