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?
Practice Questions
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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?
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From two heterozygous parents (Aa x Aa), the possible genotypes are AA, Aa, and aa, resulting in 3 different genotypes.
Questions & Step-by-step Solutions
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Q
Q: 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?
Solution: From two heterozygous parents (Aa x Aa), the possible genotypes are AA, Aa, and aa, resulting in 3 different genotypes.
Steps: 5
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.
