Question

Explain the term selective pressure as it relates to changes in populations

Answer 1

Selection pressure are external agents which affect an organism ability to survive in a given environment, selection pressures can be negative ( decreases to occurrence of a trait) or positive ( increases the proportion of a trait)

Answer 2

Selection pressures are external agents which affect an organism's ability to survive in a given environment. Selection pressures can be negative (decreases the occurrence of a trait) or positive (increases the proportion of a trait)