منابع مشابه
Sexual Selection: Male-Male Competition
Aggression. Offensive action, particularly in regard to defending resources. Aggression in defending females and other resources should be favored by selection when there are fewer resources than competitors and when an individual can boost fitness by forcibly removing another individual. Intersexual Selection. Sexual selection due to interactions between the sexes. Mate choice by males or fema...
متن کاملRegulation of male sexual development by Sry and Sox9.
Sry, a gene from the Y chromosome, is known to initiate testis formation and subsequent male differentiation in mammals. A related gene, Sox9, also plays a critical role in testis determination, possibly in all vertebrates. A number of models have been presented regarding the molecular modes of action of these two genes. However, details regarding their regulation, regulatory target genes, and ...
متن کاملMale development tracks rapidly shifting sexual versus natural selection pressures
Theory predicts that interplay between sexual and natural selection shapes phenotypic distributions over evolutionary time [1–3]. We show that this also significantly affects individual development. Developmental plasticity, whereby individuals vary their ontogeny in response to variation in the selection to be encountered upon maturity [4–6], has previously been demonstrated in response to sin...
متن کامل46,XX Male Disorder of Sexual Development: A Case Report
The main factor influencing sex determination of an embryo is the sex-determining region Y (SRY), a master regulatory gene located on the Y chromosome. The presence of SRY causes the bipotential gonad to differentiate into a testis. However, some individuals carry a Y chromosome but are phenotypically female (46,XY females) or have a female karyotype but are phenotypically male (46,XX males). 4...
متن کاملMale Sexual Jealousy
Sexual jealousy functions to defend paternity confidence and is therefore expected to be a ubiquitous aspect of male psychology. Several lines of evidence confirm this expectation. Cross-cultural and historical reviews of adultery law reveal remarkable conceptual consistency: unauthorized sexual contact with a married woman is a crime and the victim is the husband. We find male sexual jealousy ...
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ژورنال
عنوان ژورنال: Bioscientifica Proceedings
سال: 2020
ISSN: 2515-0227
DOI: 10.1530/biosciprocs.11.001