Intro to Dihybrid Crosses - 2025
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14 Nsɛmmisa
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Dihybrid crosses: determining the chance of _____ independent events occurring together (we call this the Law of Independent Assortment).
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In rabbits, Gray fur is dominant to white fur and normal ears are dominant to black ears.
We will be using G, g, E, and e to represent our traits.
G:
g:
E:
e:
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How do you represent parents who are heterozygous for both traits?
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After using the FOIL method, what are the 4 possible combinations of alleles that can be found in the gametes?
Select FOUR correct answers.
Which gamete should go above the final box?
What will the allele combination look like in the second box?
What is the genotype in the last box?
Complete the remaining squares on your paper handout.
How many possible outcomes are there in the phenotypes of a dihybrid cross?
Based on the dihybrid cross, how many total rabbits will have gray fur (G) and normal ears (E)?
What is the phenotype of the rabbit in the next box (Ggee)?
What is the phenotype of the rabbit in the next box (ggEe)?
What is the phenotype of the rabbit in the final box (ggee)?
When TWO parents who are BOTH heterozygous for BOTH traits are crossed, the expected phenotypic ratio is ALWAYS: