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What is the expected genotypic ratio of a monohybrid cross?

Practice Questions

Q1
What is the expected genotypic ratio of a monohybrid cross?
  1. 1:1
  2. 3:1
  3. 1:2:1
  4. 9:3:3:1

Questions & Step-by-Step Solutions

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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