Question

what is a recessive trait? a trait that is disadvantageous to a species a trait that is beneficial to a species a trait that is only expressed when two copies of the matching allele are present a trait that is always expressed over other traits

Explanation:

A recessive trait is defined by its genetic expression. Traits are determined by alleles (gene variants). Recessive alleles are masked by dominant alleles. Only when an organism has two copies (homozygous) of the recessive allele does the recessive trait show.

• Option 1: A trait's "advantageous" or "disadvantageous" nature relates to its impact on survival/reproduction, not its dominance - recessive classification.
• Option 2: Similar to Option 1, benefit to a species is about natural - selection - related value, not genetic expression rules.
• Option 3: This aligns with the definition of a recessive trait (only expressed in homozygous recessive state).
• Option 4: A trait "always expressed over others" is a dominant trait, not recessive.

Answer:

A trait that is only expressed when two copies of the matching allele are present