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What is the expected ratio of phenotypes in a cross between two purebred parents

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Question: What is the expected ratio of phenotypes in a cross between two purebred parents with contrasting traits? (2019)

Options:

  1. 1:1
  2. 3:1
  3. 9:3:3:1
  4. 1:2:1

Correct Answer: 1:1

Exam Year: 2019

Solution: 

The expected ratio of phenotypes in a cross between two purebred parents with contrasting traits is 1:1 in the F1 generation when they are crossed with each other.

What is the expected ratio of phenotypes in a cross between two purebred parents

Practice Questions

Q1
What is the expected ratio of phenotypes in a cross between two purebred parents with contrasting traits? (2019)
  1. 1:1
  2. 3:1
  3. 9:3:3:1
  4. 1:2:1

Questions & Step-by-Step Solutions

What is the expected ratio of phenotypes in a cross between two purebred parents with contrasting traits? (2019)
  • Step 1: Understand what purebred parents are. Purebred parents have two identical alleles for a trait (e.g., AA or aa).
  • Step 2: Identify the contrasting traits. For example, one parent might have a dominant trait (A) and the other a recessive trait (a).
  • Step 3: Cross the two purebred parents. This means you combine their alleles (e.g., AA x aa).
  • Step 4: Determine the genotype of the offspring (F1 generation). All offspring will have the genotype Aa, which shows the dominant trait.
  • Step 5: If you cross two F1 offspring (Aa x Aa), you can find the expected phenotype ratio in the next generation (F2).
  • Step 6: The expected phenotype ratio in the F2 generation will be 3:1 (3 showing the dominant trait and 1 showing the recessive trait).
  • Step 7: However, if you only consider the F1 generation from the original cross, the expected phenotype ratio is 1:1 when they are crossed with each other.
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