Answer:
Condition 1: The population must vary in traits that are heritable.
Condition 3: Individuals pass on all traits they acquire during their lifetime.
Explanation:
Charles Darwin proposed an explanation for the mechanism of evolution in contrast to Larmack's theory. Darwin put forward his explanation based on a concept called "natural selection". The theory main features include:
- The population must vary in traits that are heritable. Variations occur within members of a population. These variations arise by chance and from within an individual. Through sexual reproduction these characteristics are transmitted to successive offsprings. Some of the variations confer an advantage to the individuals while others are disadvantageous.
- Organisms with beneficial mutations are able to pass them on to their offspring during reproduction. Sexual reproduction is significant since meiosis leads to new recombination while fertilization spreads the genes widely.
