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'Macro-evolution' is not a process in itself. Rather, it is a perspective on the effects of evolution. 'Micro-evolution' is those effects seen from close-up; by 'zooming out' one sees those same results in a wider scope called 'macro-evolution'. All evolution is driven by genetic variation and natural selection.
What else can I help you with?
Does natural selection act on genotypes?
Indirectly, yes it does. But it can only act on genotypes through their phenotypes.
WHAT NATURAL SELECTION CAN ONLY ACT ON WHICH TRAITS?
Natural selection can only act on traits that have a genetic basis, meaning they are heritable and can be passed from one generation to the next. These traits must also affect an organism's fitness, influencing its ability to survive and reproduce in its environment. Additionally, natural selection operates on phenotypic traits, which are the observable characteristics resulting from the interaction of genetics and the environment. Traits that are not expressed or that do not impact survival and reproduction are not subject to natural selection.
Why does the environment act on natural selection?
I know of no government that acts, in any direct or significant way, on natural selection.
Can natural selection occur without variation in a population?
no there is no genetic variation for natural selection to act upon
Explain what is meant by this sentence Natural selection can act only on existing traits?
The phrase "Natural selection can act only on existing traits" means that evolution through natural selection relies on variations that are already present in a population. It cannot create new traits from scratch; instead, it selects for or against traits that arise through random mutations or genetic variations. Consequently, only those traits that provide a survival or reproductive advantage in a specific environment will be favored over time. This underscores the importance of genetic diversity within populations for the process of evolution.
What does natural selection only act on?
It acts on populations.
Does natural selection act on genotypes?
Indirectly, yes it does. But it can only act on genotypes through their phenotypes.
Is inheritance a requirement for natural selection?
Yes it does. Without variance in the organisms genome, that gives variance to the phenotype, there would be nothing for natural selection to select from.
Does natural selection act on the phenotype?
yes
Why does the environment act on natural selection?
I know of no government that acts, in any direct or significant way, on natural selection.
What is the only thing that natural selection can act on?
The phenotype or genome of the individual organism. Remember, individuals are selected, populations evolve.
Can natural selection occur without variation in a population?
no there is no genetic variation for natural selection to act upon
Why does natural selection act on the phenotype and not the genotype?
in need helpl asap
Can natural selection act upon sperm cells?
From the papers I am reading there may be mechanisms to insure only top quality sperm make it into the ejaculate.
Why is genetic variation important for natural selection to drive evolution?
Genetic variation is important for natural selection to drive evolution because it provides the raw material for natural selection to act upon. Without genetic variation, there would be no diversity in traits for natural selection to favor or eliminate, and evolution would not be possible.
Is it true natural selection can act upon an individuals genotype the external of genes?
False
Can natural selection act on a population with no variation traits?
The trait is the same for all organisms.
