What is the expected genotypic ratio of a monohybrid cross?

What is the expected genotypic ratio of a monohybrid cross?

Correct Answer: 1:2:1

Step 1: Understand what a monohybrid cross is. It involves one trait with two alleles (e.g., tall and short plants).
Step 2: Identify the alleles. Let's say 'T' is the dominant allele (tall) and 't' is the recessive allele (short).
Step 3: Set up the parental generation. For example, one parent is homozygous dominant (TT) and the other is homozygous recessive (tt).
Step 4: Perform the cross. Combine the alleles from each parent: TT x tt.
Step 5: Determine the possible genotypes of the offspring. All offspring will be Tt (heterozygous).
Step 6: If you cross two heterozygous parents (Tt x Tt), the possible genotypes are: TT, Tt, and tt.
Step 7: Count the combinations: 1 TT, 2 Tt, and 1 tt.
Step 8: Write the genotypic ratio. This gives you a ratio of 1:2:1.

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