My Learning Cart
?
Categories
Account

In a genetic study, if a trait is controlled by a single gene with two alleles,

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

What’s inside this PDF?

Question: In a genetic study, if a trait is controlled by a single gene with two alleles, how many different genotypes can be formed from two heterozygous parents?

Options:

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

Correct Answer: 3

Solution: 

From two heterozygous parents (Aa x Aa), the possible genotypes are AA, Aa, and aa, resulting in 3 different genotypes.

In a genetic study, if a trait is controlled by a single gene with two alleles,

Practice Questions

Q1
In a genetic study, if a trait is controlled by a single gene with two alleles, how many different genotypes can be formed from two heterozygous parents?
  1. 1
  2. 2
  3. 3
  4. 4

Questions & Step-by-Step Solutions

In a genetic study, if a trait is controlled by a single gene with two alleles, how many different genotypes can be formed from two heterozygous parents?
  • Step 1: Understand that each parent has two alleles for the trait. In this case, both parents are heterozygous, meaning they have one dominant allele (A) and one recessive allele (a). So, the genotypes of the parents are Aa and Aa.
  • Step 2: Set up a Punnett square to visualize the possible combinations of alleles from the two parents. The rows represent one parent's alleles and the columns represent the other parent's alleles.
  • Step 3: Fill in the Punnett square. The combinations will be: AA (from A and A), Aa (from A and a), Aa (from a and A), and aa (from a and a).
  • Step 4: Count the different genotypes that appear in the Punnett square. The genotypes are AA, Aa, and aa.
  • Step 5: Identify that there are 3 different genotypes: AA, Aa, and aa.
  • Mendelian Genetics – Understanding how traits are inherited through alleles and the formation of genotypes from parental combinations.
  • Punnett Square – Using a Punnett square to visualize the combinations of alleles from two parents.
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