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An index of multimedia and text resources that can be used to support students in investigating the similarities and differences between eggs of different species and the role meiosis plays in sexual reproduction.

Commonalities observed across gametes in all sexually reproducing organisms provides evidence for the unity of life. However, many differences demonstrate the role of natural selection in ensuring organisms are uniquely adapted to their habitat and lifestyle. In this sequence, students explore ova to begin to tease out evolutionary relationships, gain a deeper understanding of adaptive reproductive strategies, and to discover the function of meiosis.

Different plant and animal species employ different strategies for reproducing sexually. One key area where these differences are observable is in their method of gamete production and their fertilization methods. In this sequence, students compare different species' gamete production and fertilization methods to those of humans; allowing them to consider the reproduction advantage of different methods.