Question

4 multiple choice 1 point which of the following gene variations (alleles) are heterozygous? f2f2 f3f3 none of these f2f1

Explanation:

To determine heterozygous alleles, recall that heterozygous means having two different alleles (e.g., \( Aa \)), while homozygous has two identical alleles (e.g., \( AA \) or \( aa \)).

• \( F2F2 \): Homozygous (two \( F2 \) alleles).
• \( F3F3 \): Homozygous (two \( F3 \) alleles).
• \( F2F1 \): Has two different alleles (\( F2 \) and \( F1 \)), so it is heterozygous.
• "none of these" is incorrect because \( F2F1 \) is heterozygous.

Answer:

D. F2F1 (assuming the options are ordered as: A. F2F2, B. F3F3, C. none of these, D. F2F1)