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Am I a Girl, or a Boy?

A baby is born with ambiguous genitalia to parents from the Dominican Republic and is determined to be a female based on general appearance.  ...


Anencephaly in Yakima

This case study explores the recent (2010 - 2016) outbreak of neural tube defects, specifically anencephaly, in a rural three-county region of Wash ...


Born for Recovery: The Effects of Maternal Methadone Use on Neonates

This interrupted case study presents the story of "Jane Paul," a 27-year-old pregnant woman excited by the prospect of bringing a new life into the ...


Bringing Home More than a Medal

This case study was inspired by the Zika virus outbreak that occurred around the time of the 2016 Olympic Games. Many athletes were fearful of atte ...


Do You See What Eye See?

A common misconception is that Darwin suggested that something as complex as the eye could not have evolved through natural selection. While the mi ...


Don’t Lose Your Head!

This whimsical case introduces students to the topic of dorsal/ventral (DV) axis formation in amphibians. After the recent birth of a good-sized cl ...


Gender: In the Genes or in the Jeans?

How are males and females different? Most people have a sex that is consistent on all levels: genetic, gonadal, internal genitals, external genital ...


Going for Gold

This case study introduces students to the true story of Caster Semenya, an outstanding female mid-distance runner from South Africa.  Caster ...


Hyper-IgM Syndrome

Hyper-IgM syndrome is an X-linked genetic disorder more commonly affecting males than females. It is caused by the lack of heavy chain class-switch ...


Nature or Nurture

This case explores the question of whether gender identity is determined strictly by genetics (nature) or social variables (nurture).  It is b ...


Peek-a-Bamboo!

This case study was written for an introductory course for biology majors who are first learning about embryonic development. The case is composed ...


Sonic Hedgehog

In this case study about a baby born with the genetic condition holoprosencephaly, students explore the “Sonic hedgehog” gene, signal t ...


The Dangers of Deicing

Loss of species richness is often due to anthropogenic activity. The global decline of amphibians is one such example. This case study examines the ...


The Horseshoe Crab

This case study examines the population dynamics of the horseshoe crab, which is sometimes described as a “living fossil.” Students are ...


The Lady of Charleston?

This case uses the real story of Dawn Langley Simmons, who may have been misidentified as male at birth, to illustrate the developmental basis of h ...