Question

a genetic cross involving two unlinked genes is represented: aagg × aagg. which genotype is not possible in the offspring produced by the cross? aagg aagg aagg aagg

Explanation:

Step1: Analyze gene A

Parent 1: \( Aa \), Parent 2: \( aa \).
Possible genotypes for A: \( Aa \) (from \( A \times a \)) and \( aa \) (from \( a \times a \)).

Step2: Analyze gene G

Parent 1: \( GG \), Parent 2: \( Gg \).
Possible genotypes for G: \( GG \) (from \( G \times G \)) and \( Gg \) (from \( G \times g \)). Parent 1 can only give \( G \), so offspring can't have \( gg \).

Step3: Check each option

• \( aaGG \): Possible ( \( aa \) from A, \( GG \) from G).
• \( AaGG \): Possible ( \( Aa \) from A, \( GG \) from G).
• \( Aagg \): Has \( gg \) for G, impossible (Parent 1 gives \( G \), can't get \( g \) from both to make \( gg \)).
• \( aaGg \): Possible ( \( aa \) from A, \( Gg \) from G).

Answer:

Aagg