Question

question 6 which of these crosses will produce only heterozygous offspring? aa×aa aa×aa aa×aa aa×aa

Explanation:

Step1: Analyze \(AA\times aa\)

• Parent 1: \(AA\) can produce only \(A\) gametes.
• Parent 2: \(aa\) can produce only \(a\) gametes.
• Offspring genotype: \(Aa\) (all heterozygous).

Step2: Analyze \(AA\times Aa\)

• Parent 1: \(AA\) produces \(A\) gametes.
• Parent 2: \(Aa\) produces \(A\) and \(a\) gametes.
• Offspring genotypes: \(AA\) (homozygous) and \(Aa\) (heterozygous).

Step3: Analyze \(Aa\times Aa\)

• Both parents produce \(A\) and \(a\) gametes.
• Offspring genotypes: \(AA\) (homozygous), \(Aa\) (heterozygous), \(aa\) (homozygous).

Step4: Analyze \(Aa\times aa\)

• Parent 1: \(Aa\) produces \(A\) and \(a\) gametes.
• Parent 2: \(aa\) produces \(a\) gametes.
• Offspring genotypes: \(Aa\) (heterozygous) and \(aa\) (homozygous).

Answer:

\(AA\times aa\)