Environmental variation - twins Illustration Play

External and internal fertilization Slideshow Play

External fertilization in newts and salamanders Animation Play

Famine Whiteboard exercise Play

Features of a sperm cell Whiteboard exercise Play

Features of an ovum cell Whiteboard exercise Play

Female reproductive organs Animation Play

Fertilization Student activity Play

Fertilization and development Student activity Play

Fertilization and the first weeks of the embryo's life Whiteboard exercise Play

Fertilization and the first weeks of the embryo's life Student activity Play

Formation of the embryo sac and pollen grain Slideshow Play

Frequency of magnetic waves Student activity Play

Frequency of magnetic waves Illustration Play

Gametes and fertilization Student activity Play

Gonads of invertebrates Animation Play

Gymnosperms – seed plants with sporophyte and gametophyte generations Student activity Play

Hermaphroditism Slideshow Play

Heterogeny; gonochorism and hermaphroditism Student activity Play

Hormones affecting human sexual development Whiteboard exercise Play

Hormones produced in the endocrine glands Student activity Play

Human reproduction Student activity Play

Inheritance of sex chromosomes in humans Student activity Play

Inheritance of sex-linked traits Whiteboard exercise Play

Inheritance of sex-linked traits Student activity Play