Question

trait such as tt is said to be heterozygous; homozygous; heterozygous; rr; pp; pp; tt; tt; tt

Explanation:

To solve this, we first recall the definitions:

• Homozygous: Genotype with identical alleles (e.g., \( RR \), \( pp \), \( TT \), \( nn \)).
• Heterozygous: Genotype with different alleles (e.g., \( Tt \), \( Rr \), \( Yy \)).

Step 1: Analyze the "Homozygous" column

Check each genotype:

• \( RR \): Both alleles \( R \) (identical) → Homozygous.
• \( PP \): Both alleles \( P \) (identical) → Homozygous.
• \( pp \): Both alleles \( p \) (identical) → Homozygous.
• \( nn \): Both alleles \( n \) (identical) → Homozygous.
• \( TT \): Both alleles \( T \) (identical) → Homozygous.

Step 2: Analyze the "Heterozygous" column

Check each genotype:

• \( Tt \): Alleles \( T \) and \( t \) (different) → Heterozygous.
• \( ff \): Both alleles \( f \) (identical) → Not Heterozygous (should be homozygous).

Step 3: Correct the misclassification

The genotype \( ff \) has identical alleles, so it belongs in the Homozygous column, not Heterozygous.

Answer:

The genotype \( ff \) is homozygous (has identical alleles \( f \) and \( f \)), so it should be moved to the "Homozygous" column.