How to solve dihybryd cross genetics problems - step by step
s I said in part I of these tips and instructions, all genetics problems are solved according to the same pattern. When we complicate the problem by following more than one gene at a time, we aren’t violating this promise. The logic of a problem involving two genes is exactly the same as for one involving only one gene. So let’s see how the rules are applied.
Here’s a reminder of those steps to follow:
Step 1: Figure out the genotypes of the parents.
Step 2: Figure out what kinds of gametes the parents can produce.
Step 3: Set up a Punnett Square for your mating.
Step 4: Fill in the babies inside the table by matching the egg allele at the top of the column with the sperm allele at the head of the row.
Step 5: Figure out the genotypic ratio for your predicted babies.
Step 6: Figure out the phenotypic ratio for your predicted babies.
Step 7: Answer the question you’ve been asked.
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