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In a certain species, the allele for tall plants (T) is dominant over the allele

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Question: In a certain species, the allele for tall plants (T) is dominant over the allele for short plants (t). If a tall plant (Tt) is crossed with a short plant (tt), what is the expected genotypic ratio of the offspring?

Options:

  1. 1:1
  2. 3:1
  3. 1:2:1
  4. 2:1

Correct Answer: 1:1

Solution: 

The cross Tt x tt results in a genotypic ratio of 1 Tt (tall) to 1 tt (short), which is 1:1.

In a certain species, the allele for tall plants (T) is dominant over the allele

Practice Questions

Q1
In a certain species, the allele for tall plants (T) is dominant over the allele for short plants (t). If a tall plant (Tt) is crossed with a short plant (tt), what is the expected genotypic ratio of the offspring?
  1. 1:1
  2. 3:1
  3. 1:2:1
  4. 2:1

Questions & Step-by-Step Solutions

In a certain species, the allele for tall plants (T) is dominant over the allele for short plants (t). If a tall plant (Tt) is crossed with a short plant (tt), what is the expected genotypic ratio of the offspring?
  • Step 1: Identify the genotypes of the parent plants. The tall plant has the genotype Tt and the short plant has the genotype tt.
  • Step 2: Set up the cross between the two plants: Tt (tall) x tt (short).
  • Step 3: Determine the possible gametes (alleles) from each parent. The tall plant (Tt) can produce gametes T and t, while the short plant (tt) can only produce gametes t.
  • Step 4: Create a Punnett square to visualize the cross. Place the gametes of one parent on the top and the gametes of the other parent on the side.
  • Step 5: Fill in the Punnett square by combining the gametes. The combinations will be: Tt (from T and t) and tt (from t and t).
  • Step 6: Count the genotypes of the offspring. You will have 1 Tt (tall) and 1 tt (short).
  • Step 7: Write the genotypic ratio. The ratio of Tt to tt is 1:1.
  • Mendelian Genetics – Understanding dominant and recessive alleles and how they affect offspring traits.
  • Punnett Square – Using a Punnett square to predict the genotypic and phenotypic ratios of offspring from a genetic cross.
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