What is the expected genotype ratio from a cross between two heterozygous individuals (Aa x Aa)?
Practice Questions
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Q1
What is the expected genotype ratio from a cross between two heterozygous individuals (Aa x Aa)?
1:1
3:1
1:2:1
9:3:3:1
The expected genotype ratio from a cross between two heterozygous individuals (Aa x Aa) is 1:2:1, representing the possible combinations of alleles.
Questions & Step-by-step Solutions
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Q
Q: What is the expected genotype ratio from a cross between two heterozygous individuals (Aa x Aa)?
Solution: The expected genotype ratio from a cross between two heterozygous individuals (Aa x Aa) is 1:2:1, representing the possible combinations of alleles.
Steps: 7
Step 1: Understand that 'Aa' means one dominant allele (A) and one recessive allele (a).
Step 2: Set up a Punnett square to visualize the cross between two Aa individuals.
Step 3: Write the alleles of one parent (Aa) on the top of the Punnett square and the alleles of the other parent (Aa) on the side.
Step 4: Fill in the Punnett square by combining the alleles from each parent.
Step 5: The combinations you will get in the squares are: AA, Aa, Aa, and aa.
Step 6: Count the genotypes: 1 AA, 2 Aa, and 1 aa.
Step 7: Write the ratio of the genotypes: 1 AA : 2 Aa : 1 aa.
