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In a dihybrid cross, what is the expected phenotypic ratio in the F2 generation?

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Question: In a dihybrid cross, what is the expected phenotypic ratio in the F2 generation?

Options:

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

Correct Answer: 9:3:3:1

Solution: 

The expected phenotypic ratio in the F2 generation of a dihybrid cross is 9:3:3:1, representing the combinations of two traits.

In a dihybrid cross, what is the expected phenotypic ratio in the F2 generation?

Practice Questions

Q1
In a dihybrid cross, what is the expected phenotypic ratio in the F2 generation?
  1. 3:1
  2. 1:2:1
  3. 9:3:3:1
  4. 1:1:1:1

Questions & Step-by-Step Solutions

In a dihybrid cross, what is the expected phenotypic ratio in the F2 generation?
Correct Answer: 9:3:3:1
  • Step 1: Understand what a dihybrid cross is. It involves two traits, each with two alleles.
  • Step 2: Identify the parental generation (P generation) with two traits. For example, let's say we have tall (T) vs. short (t) plants and yellow (Y) vs. green (y) seeds.
  • Step 3: Cross the two parental plants to create the first generation (F1). All offspring will be heterozygous for both traits (TtYy).
  • Step 4: In the F1 generation, perform a self-cross (TtYy x TtYy) to create the second generation (F2).
  • Step 5: Use a Punnett square to determine the combinations of traits in the F2 generation. You will have 16 possible combinations.
  • Step 6: Count the phenotypes (observable traits) from the combinations. You will find 9 with both dominant traits, 3 with the first dominant and second recessive, 3 with the first recessive and second dominant, and 1 with both recessive traits.
  • Step 7: Write down the expected phenotypic ratio: 9 (dominant-dominant) : 3 (dominant-recessive) : 3 (recessive-dominant) : 1 (recessive-recessive).
  • Dihybrid Cross – A genetic cross between individuals that differ in two traits, typically involving two pairs of alleles.
  • Phenotypic Ratio – The ratio of different phenotypes that appear in the offspring from a genetic cross.
  • F2 Generation – The second filial generation, which is produced by crossing two F1 individuals.
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