If a plant with genotype AaBb is crossed with another AaBb plant, what fraction

If a plant with genotype AaBb is crossed with another AaBb plant, what fraction of the offspring will be homozygous recessive for both traits?

If a plant with genotype AaBb is crossed with another AaBb plant, what fraction of the offspring will be homozygous recessive for both traits?

Correct Answer: 1/16

Step 1: Identify the genotypes of the parent plants. Both plants are AaBb.
Step 2: Determine the possible gametes (sperm and egg) each parent can produce. Each parent can produce four types of gametes: AB, Ab, aB, and ab.
Step 3: Set up a Punnett square to visualize the cross. Create a 4x4 grid to represent the combinations of gametes from both parents.
Step 4: Fill in the Punnett square with the combinations of gametes. Each cell in the grid will represent a possible genotype of the offspring.
Step 5: Count the number of offspring that are homozygous recessive for both traits (aabb). Look for the combination 'aabb' in the Punnett square.
Step 6: Calculate the total number of offspring combinations. There are 16 total combinations in the Punnett square.
Step 7: Determine the fraction of offspring that are homozygous recessive (aabb). There is 1 'aabb' combination out of 16 total combinations.
Step 8: Write the fraction as 1/16.

Mendelian Genetics – Understanding how traits are inherited through dominant and recessive alleles using Punnett squares.
Genotype and Phenotype – Differentiating between homozygous and heterozygous genotypes and their implications for offspring traits.
Probability in Genetics – Calculating the probability of specific genotypes in offspring from parental crosses.