[A boy or a girl: who decides?].
In theory, humans produce an equal proportion of boys and girls. However, neither at conception nor at birth are both sexes equally represented. Environmental and individual changes are thought to play a role in the observed sex-ratiodeviations. One of the key-mediator may be the individual (genetic) and environmental hormonal variations and their influence on gametogenesis, embryo implantation and development.
Paoloni-Giacobino
Ariane
A
University of Pittsburgh, Department of Molecular Genetics, W1004BST, 200 Lothrop Street, Pittsburgh, PA 15213, USA. apgiacob@pitt.edu
D003657:Decision Making; D004777:Environment; D004992:Ethics, Medical; D005260:Female; D006801:Humans; D008297:Male; D027724:Reproductive Techniques, Assisted / Q000941:ethics; D019849:Sex Determination Processes; D012744:Sex Ratio