Dihybrid Crosses
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Transcript of Dihybrid Crosses
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Dihybrid CrossesBy the end of today you should be able to:Use the Punnett sqaure method to solve basic dihybrid cross problems
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• 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?
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• 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?
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•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?
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•All the resultant offspring were round yellow peas, with the genotype of RrYy.
•How do we know that?
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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.
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•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