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Experiment 1: <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />Punnett SquareCrosses<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />In this experiment you will usemonohybrid and dihybrid crosses to predict patterns of inheritance.
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Materials
Blue BeadsGreen BeadsRed Beads
Yellow Beads(2) 100 mL BeakersPermanent Marker
Procedure:
Part 1: Punnett Squares
Y Y and Y y
Y Y and y y
a)
YY Ss:
______
b)
Yy Ss:
c)
Create a Punnett square using these gametes as P and determine the genotypes of the F1:
What are the phenotypes? What is theratio of those phenotypes?
Part 2 and 3 Setup
Assumptions for the remainder of theexperiment:
1. Yellow (Y) vs. Blue (y)
2. Green (G) vs. Red (g).
Part 2: Monohybrid Cross
Table 1: Parent Genotypes: Monohybrid Crosses
Generation
Genotype of Individual 1
Genotype of Individual 2
P
P1
P2
P3
P4
Table 2: Generation Data Produced by Monohybrid Crosses
Parents
Possible Offspring Genotypes
Possible Offspring Phenotypes
Genotype Ratio
Phenotype Ratio
Post-Lab Questions
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