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I would suppose stabilizing selection could do that. Selecting for the mean morphology and behavior would be somewhat in stasis if the environment did not change.
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∙ 12y ago
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What selection favors organisms with phenotypes that are at one extreme rlative to the average phenotype?
Tends to result in a population whose individuals have extreme traits is what? ----> it is directional selection
Is survival in the genes?
The process of evolution tends to produce organisms whose genes contribute to the survival of the organism. If an organism has genes which impede or prevent survival, then the organism is less likely to survive. A species with such genetics would die out.
What is the homeostatsis?
In a general sense, homeostasis is the property of a system, either open or closed, that regulates its internal environment and tends to maintain a stable, constant condition. More specifically, in science, homeostasis is the ability for something to maintain or return to an equilibrium state. Cellular homeostasis and natural evolution are examples of this.
What is the role of gene flow in speciation?
None. Gene flow between two groups of the same population tends to stabilize alleles, or one way gene flow tends to not change allele frequency enough for speciation. The only speciation driver we know of is natural selection working on two allopatic species separately. Different populations, due to this geographic separation, can speciated, but gene flow between them, whatever the direction, will tend to bring things to a stability, or to a situation that is not enough for speciation.
What is the definition of selective pressure?
Selective pressure is any phenomena which alters the behavior and fitness of living organisms within a given environment. It is the driving force of evolution and natural selection, and it can be divided into two types of pressure: biotic or abiotic
Which type of selection tends to increase genetic variation?
Natural Selection.
What selection favors organisms with phenotypes that are at one extreme rlative to the average phenotype?
Tends to result in a population whose individuals have extreme traits is what? ----> it is directional selection
What variation and adaptation do with heredity and genetics?
Evolution: genes are mixed and swapped and mutated during the production of gametes (egg and sperm) and these are passed on to offspring. The variations (mutations) can be good, neutral, or bad, and natural selection tends to cause those with good variations to be kept, and bad to be rejected. Natural selection keeping good variations leads to adaption into an environmental niche which allows for better survival.
What level does natural selection occur at?
natural selection occurs when animals need it
What is the purpose of natural selecting?
Natural selection is not a purposeful action, but an effect. The process tends to keep living things living no matter how the environment may change. Natural selection eliminates weaker individuals and allows stronger ones to live, producing evolution. For instance, if fish lived in a shady place with dark water, the ones with the darker tones would be able to evade predators allowing them to live. They then would be able to reproduce and pass their genes on, while the ones without darker tones would be eaten and not be able to. That shows natural selection. --- There is no purpose to natural selection. Natural selection is an effect produced by the differential reproductive success of differing variants within a population. This effect often results in adaptation of the population to a particular set of circumstances. This is an automatic result of the simple fact that variants that are better capable of producing and raising offspring will on average have more fertile offspring.
What is the smallest level on which evolution can occur?
Natural selection acts upon the individual organism, whilst evolution occurs at the population level. The environment selects for organisms best adapted for highest survival and reproductive success. Natural selection requires three key things - variation, inheritable traits, and differential survival/reproduction. Species will produce more offspring than the environment can support(carrying capacity), and the population tends to be fairly stable until resources are limited. A struggle for existence is created, and natural selection ensures that weaker traits die out while stronger traits live on. Organisms show variation in characteristics, and that variation is heritable. Survival depends on inherited traits, and unequal survival/reproduction leads to adaptation and evolution. Therefore, while the individual organism can adapt, the population is what actually evolves.
Is survival in the genes?
The process of evolution tends to produce organisms whose genes contribute to the survival of the organism. If an organism has genes which impede or prevent survival, then the organism is less likely to survive. A species with such genetics would die out.
What tends to result in a population whose individuals have extreme traits?
Directional Selection
Selection favors one extreme form of a trait in a population.?
Tends to result in a population whose individuals have extreme traits is what? ----> it is directional selection
The internal resistance of a fluid which tends to prevent it from flowing is called?
Viscosity
Tends to favor phenotypes at one extreme of the range of variation?
DIRECTIONAL Selection
What is the force which tends to prevent motion between two surfaces called?
friction force
