Chapter 10 - Introduction

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To fully appreciate this tutorial, you should be familiar with the concepts of:
• Phenotype
• Genotype
• Alleles
• Heterozygous
• Homozygous
• Homologous chromosomes
• Nonhomologous chromosomes
• Loci

After this tutorial, you will be able to describe:
• Allele pairing (by independent assortment) in gametes for dihybrid crosses
• A phenotypic ratio for a dihybrid cross

How do you predict the outcome of dihybrid crosses?

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Monohybrid Crosses
Monohybrid and Dihybrid Crosses
Dihybrid Crosses
Punnett Square for Dihybrid Cross
Phenotypic Ratio
Summary

Genetics is based on predictable patterns of inheritance. Understanding genetics depends on understanding these patterns, which are based on possible combinations of gametes. Punnett squares provide a way to determine these combinations. Thus, it is possible to predict offspring traits.