genetic variation
no there is no genetic variation for natural selection to act upon
Neither. Lamarckian evolution does not take place at all; almost all of his concepts are now known to be incorrect. The population will still undergo mutation, and natural selection for beneficial mutations and against harmful ones will still occur.
Natural selection may not occur in a population if there is no variation in traits among individuals, if all traits are selectively neutral, or if the environment is stable and consistently favors all individuals equally. Additionally, if all individuals are equally successful in reproducing and passing on their genes, natural selection may not be operating in that population.
For natural selection to occur in a population, there must be variation in traits among individuals and differential survival and reproduction based on those traits. This means that some traits give individuals a better chance of surviving and reproducing in their environment than others, leading to changes in the population over time.
For natural selection to occur, there must be variation in traits among individuals in a population, and these traits must be heritable. Additionally, there must be differential survival and reproduction, meaning that individuals with advantageous traits are more likely to survive and reproduce. Over time, these advantageous traits become more common in the population, leading to evolution.
What population? Perhaps you mean if there were no variation for natural selection to select from.
There must be genetic variation, the variation must be heritable, and there must be differential reproduction (due to competition).
no there is no genetic variation for natural selection to act upon
natural selection or genetic drift
Neither. Lamarckian evolution does not take place at all; almost all of his concepts are now known to be incorrect. The population will still undergo mutation, and natural selection for beneficial mutations and against harmful ones will still occur.
Without variation there is nothing to select from.
Natural selection may not occur in a population if there is no variation in traits among individuals, if all traits are selectively neutral, or if the environment is stable and consistently favors all individuals equally. Additionally, if all individuals are equally successful in reproducing and passing on their genes, natural selection may not be operating in that population.
Variation in traits within a population is what causes natural selection to occur. When individuals in a population exhibit different traits, those that are better suited to their environment are more likely to survive and reproduce, passing on those advantageous traits to the next generation. This process leads to the gradual change of a population over time.
For natural selection to occur in a population, there must be variation in traits among individuals and differential survival and reproduction based on those traits. This means that some traits give individuals a better chance of surviving and reproducing in their environment than others, leading to changes in the population over time.
There are really no steps in natural selection - just conditions required for it to occur.
Without genetic diversity, natural selection cannot occur
For natural selection to occur, there must be variation in traits among individuals in a population, and these traits must be heritable. Additionally, there must be differential survival and reproduction, meaning that individuals with advantageous traits are more likely to survive and reproduce. Over time, these advantageous traits become more common in the population, leading to evolution.