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We have split our older mitosis, meiosis and fertilization activity into two enhanced closely-linked activities:

• Mitosis – How Each New Cell Gets a Complete Set of Genes
• Meiosis and Fertilization – Understanding How Genes Are Inherited

Major enhancements include:

• more explicit discussion of the links between genotype and phenotype
• more discussion of how meiosis and fertilization result in genotypic and phenotypic variation in offspring (with explicit discussion of independent assortment and crossing over)
• clarification of many of the questions and instructions for using the model chromosomes
• increased background information in the Teacher Preparation Notes.

Teachers who have previously made the model chromosomes for our earlier activity, "Mitosis, Meiosis and Fertilization", can find the Student Handout and Teacher Preparation Notes for that older activity at /exchange/waldron/mitosismeiosis . However, we encourage you to modify your model chromosomes for use in this new pair of activities, since we believe this version will enhance student understanding of important concepts.