Sexual behavior and sex preference in animals and humans are shaped by complex interactions between the brain and hormones during early development. One critical factor is exposure to androgens (male ...

Download this Chromosome Disorder Icon Pictogram Structural Anomaly And Alert Symbol vector illustration now. And search more of iStock's library of royalty-free vector art that features Alertness ...

Earlier research established that the SRY gene on the Y chromosome is the "master switch" for turning on the development of male organs in mammals. An enzyme called JMJD1A plays an important role ...

The chromosomes that demonstrate the sex of a human are XX and XY. Indeed, we get one of each from our parents. Women can only pass on the X chromosome, while it's male sperm that determines whether a ...

3. Face and Front Colors/Markings Unlike most other penguin species, you can often tell the male (left) and female (right) apart in Galápagos penguin pairs on sight alone. ©pianoman555/ via Getty ...

Female faces received significantly higher attractiveness ratings than male faces, an effect size that the authors describe as medium to large. That difference held across both same-sex and ...

Letter Published: 10 June 1961 Non-disjunction of the Sex-chromosomes in the Male of Drosophila melanogaster P. J. KELSALL Nature 190, 1035–1036 (1961) Cite this article ...

Radical reformers hoping to see the possibility of a female monarch in the future will almost certainly be disappointed, but the women of the imperial family do stand to gain from the reforms.