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The Punnett square is a simple simulation of sexual reproduction meiosis followed by fertilization Punnett squares allow you to predict the likely results of sexual reproduction for both individuals and populations Today s lab will help you set up and solve some simple Punnett squares at the level of the individual The first step of doing a Punnett square is to determine the likely gametes that can be produced by the individual parents i e determine the possible results of meiosis For a single parent and considering a single gene on two homologous chromosomes this is straightforward The gametes that result from meiosis of the haploid cell can have either the allele on one chromosome or the allele on the other there are no other options Genotypes of diploid cells are generally denoted with simple abbreviations For example for a species with only two alleles for a given gene the Alleles can be represented by any letter using different cases For example we can let A represent one allele and a represent a second allele for the same gene we could use A A a a etc to represent more alleles as needed Below are three different possible genotypes for a diploid individual using this system of representation For each determine the possible haploid genotypes of Gametes that meiosis could produce MONOHYBRID CROSS Determining the possible gamete genotypes each diploid can produce Diploid genotype AA Aa Parental description Homozygous A 2 identical A alleles Heterozygous 2 different alleles Homozygous a 2 identical a alleles aa Parental description Homozygous B 2 identical B alleles Heterozygous 2 different alleles Possible gamete haploid genotypes A A or a To keep track of separate genes we can simply use different letters For example if A and a represent different alleles for hair color then we might use B and b to represent alleles for eye color Diploid genotype a With your group determine the possible gamete genotypes each diploid individual can produce Possible gamete haploid genotypes List all

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