Dihybrid test cross
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Consider the following two genotypes: AABB , aabb where A and B are dominant and a and b are recessive:
1) What is the genotype of the F1 progeny from an AABB x aabb cross?
2) Construct a Punnet square of the F1 self cross (i.e. F1 x F1). What are the genotypic ratios from this testcross? What are the phenotypic ratios?
3) Construct a Punnet square of the F1 genotype with the AABB parental. What are the genotypic ratios from thsi cross? What are the phenotypic ratios?
4) Construct a Punnet square of the F1 genotype with the aabb parental. What are the genotypic ratios? What are the phenotypic ratios?
5) If you had an organism that was A- B- and wanted to determine its exact genotype, which cross would you use? Explain your answer.
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Solution Summary
Detailed explanation of dihybrid test crosses with Punnett squares.
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1) What is the genotype of the F1 progeny from an AABB x aabb cross?
First, determine the gametes possible for each parent. AABB can only produce AB gametes. aabb can only produce gametes aa. The only possible offspring are AaBb
2) Construct a Punnet square of the F1 self cross (i.e. F1 x F1). What are the genotypic ratios from this testcross? What are the phenotypic ratios?
Since all the offspring on the cross are AaBb, the F1 cross would be AaBb x AaBb
Punnett square
AB Ab aB ab
AB AABB AABb AaBB ...
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