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This interactive module explores the biology of sex determination and development in humans, set against the backdrop of the different sex testing policies implemented throughout sports history.

This short video explores how a baby’s microbiome is established during birth.

This video describes how scientists silence different genes in regenerating planaria to study the process of regeneration at the molecular level.

This interactive module explores how mutations arise in germline and somatic cells. It also shows how these mutations can lead to genetic conditions, such as cystic fibrosis and cancer.

This animation shows how a region of the brain called the cerebral cortex develops in a human fetus.

This animation tracks how the human brain develops over nine months of gestation.

This animation shows how varying concentrations of a signaling molecule activate different transcription factors to determine cell fate.

This animation gives an overview of how a fertilized human egg develops into an embryo.

This animation describes the formation and fates of the three germ layers in a human embryo.

This animation shows how somatic cell nuclear transfer (SCNT) creates an embryo from an egg cell and a body cell.

This animation shows how X chromosomes are randomly switched off in most female mammals.

This video provides a demonstration of differences between sexual reproduction, which involves recombination through meiosis, and asexual reproduction, which does not.