My Learning Cart
?
Categories
Account

In a dihybrid cross between two pea plants, one with genotype AaBb and the other

₹0.0
Login to Download
  • 📥 Instant PDF Download
  • ♾ Lifetime Access
  • 🛡 Secure & Original Content

What’s inside this PDF?

Question: In a dihybrid cross between two pea plants, one with genotype AaBb and the other with genotype Aabb, what fraction of the offspring will be homozygous recessive for both traits?

Options:

  1. 1/16
  2. 1/8
  3. 1/4
  4. 1/2

Correct Answer: 1/8

Solution: 

The cross AaBb x Aabb results in 1/8 of the offspring being aabb (homozygous recessive for both traits).

In a dihybrid cross between two pea plants, one with genotype AaBb and the other

Practice Questions

Q1
In a dihybrid cross between two pea plants, one with genotype AaBb and the other with genotype Aabb, what fraction of the offspring will be homozygous recessive for both traits?
  1. 1/16
  2. 1/8
  3. 1/4
  4. 1/2

Questions & Step-by-Step Solutions

In a dihybrid cross between two pea plants, one with genotype AaBb and the other with genotype Aabb, what fraction of the offspring will be homozygous recessive for both traits?
  • Step 1: Identify the genotypes of the parent plants. One parent is AaBb and the other is Aabb.
  • Step 2: Determine the possible gametes (sperm or egg cells) each parent can produce. The first parent (AaBb) can produce gametes AB, Ab, aB, and ab. The second parent (Aabb) can produce gametes Ab and ab.
  • Step 3: Create a Punnett square to visualize the combinations of the gametes from both parents. The rows will represent the gametes from AaBb and the columns will represent the gametes from Aabb.
  • Step 4: Fill in the Punnett square with the combinations of the gametes. You will have the following combinations: AB, Ab, aB, ab from the first parent and Ab, ab from the second parent.
  • Step 5: List the resulting genotypes from the Punnett square. You will get: AABB, AABb, AaBB, AaBb, Aabb, Aabb, aabb, aabb.
  • Step 6: Count the total number of offspring genotypes. There are 8 total combinations.
  • Step 7: Identify the genotype that is homozygous recessive for both traits, which is aabb. Count how many times aabb appears in the results.
  • Step 8: Calculate the fraction of offspring that are aabb. There are 1 aabb out of 8 total combinations, so the fraction is 1/8.
  • Dihybrid Cross – A genetic cross involving two traits, where each trait is represented by two alleles.
  • Genotype and Phenotype – Understanding the difference between the genetic makeup (genotype) and the observable traits (phenotype) of an organism.
  • Homozygous and Heterozygous – Homozygous refers to having two identical alleles for a trait, while heterozygous refers to having two different alleles.
  • Punnett Square – A tool used to predict the genotypes of offspring from a genetic cross.
Soulshift Feedback ×

On a scale of 0–10, how likely are you to recommend The Soulshift Academy?

Not likely Very likely
Home Practice Performance eBooks