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Dihybrid Crosses. By the end of today you should be able to: Use the Punnett sqaure method to solve basic dihybrid cross problems. After crossing pea plants with one characteristic; Mendel wondered what would happen if more than one pair of characteristics were cross-fertilized.

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## Dihybrid Crosses

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**Dihybrid Crosses**By the end of today you should be able to: Use the Punnettsqaure method to solve basic dihybrid cross problems**After crossing pea plants with one characteristic; Mendel**wondered what would happen if more than one pair of characteristics were cross-fertilized. • For example, what would happen if a round yellow pea was cross-fertilized with a wrinkled green pea?**Mendel wanted to know if a gamete’s allele for the gene**encoding pea colour would affect the allele for pea shape. • Do you think one trait has an influence over another trait? Why or Why not?**Mendel, created purebred round yellow peas, which can be**represented by the genotype: RRYY • He also created purebred wrinkled green peas, represented by the genotype: rryy • He then cross fertilized these peas RRYY x rryy and recorded his observations. • What do you think the phenotype of the F1 generation was? Why do you think this?**All the resultant offspring were round yellow peas, with the**genotype of RrYy. • How do we know that?**Mendel’s 2nd Law**• The Law of Independent Assortment: when two or more pairs of characteristics are considered at one time, each pair shows dominance and segregation, independently of each other.**http://163.16.28.248/bio/activelearner/10/ch10summary.html**• This website details dihybrid crosses quite nicely. It also has a quiz so you can check your understanding of dihybrid cross problems

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