Science ❯Biology ❯Genetics ❯Human Genetics

Sex Determination

Harvard Study Links Maternal Age and Genes to Same-Sex Birth Patterns

Drawing on data from 58,000 U.S. mothers the study suggests biological changes in older women may skew birth sex ratios pending broader validation

Maternal Age and Genetics Linked to Skewed Birth Sex Ratios

Harvard Study Finds Child Sex Bias After Three Same-Gender Births