*

*
*



You are watching: Which of the following is true of natural selection?

*
*
*
*
*
*
*
Frequently inquiry Questions around Evolution
Main Page | The Basics | Where We come From | Where We"re Going | How us Know | What It way to Evolve | A issue of Time | Darwin | Why It"s Important | Evolution ~ above Trial
The Basics
1. What is evolution?
Biological evolution refers come the cumulative alters that occur in a populace over time. These changes are produced at the genetic level together organisms" genes mutate and/or recombine in different ways during reproduction and also are happen on come future generations. Sometimes, individuals inherit brand-new characteristics that give them a survival and also reproductive benefit in their regional environments; these attributes tend to boost in frequency in the population, when those that space disadvantageous decrease in frequency. This process of differential survival and also reproduction is known as herbal selection. Non-genetic changes that occur throughout an organism"s life span, together as rises in muscle mass as result of exercise and diet, cannot be pass on to the following generation and are not instances of evolution. learn MoreEvolution the Diversity
2. Isn"t evolution just a concept that remains unproven? In science, a theory is a rigorously tested statement that general ethics that defines observable and recorded elements of the world. A scientific theory as such describes a higher level of knowledge that ties "facts" together. A clinical theory stands till proven dorn -- it is never proven correct. The Darwinian theory of evolution has sustained the test of time and also thousands of scientific experiments; nothing has actually disproved it due to the fact that Darwin first proposed it an ext than 150 year ago. Indeed, plenty of scientific advances, in a variety of scientific techniques including physics, geology, chemistry, and also molecular biology, have supported, refined, and expanded evolutionary concept far past anything Darwin might have imagined.
*
Learn MoreEvolution Revolution
3. Room all types related?
Yes. Just as the tree of life illustrates, every organisms, both living and extinct, room related. Every branch the the tree represents a species, and every fork separating one varieties from one more represents the usual ancestor mutual by this species. When the tree"s numerous forks and significant branches plainly show the relatedness among types varies greatly, that is additionally easy to watch that every pair of varieties share a usual ancestor from some suggest in evolutionary history. Because that example, researchers estimate the the usual ancestor common by humans and chimpanzees lived some 5 to 8 million years ago. Humans and bacteria obviously share a much more distant common ancestor, yet our partnership to these single-celled biology is no less real. Indeed, DNA analyses show that although human beings share far an ext genetic product with our other primates 보다 we perform with single-celled organisms, us still have more than 200 gene in usual with bacteria. the is vital to realize that describing biology as loved ones does not median that one of those organisms is one ancestor that the other, or, for the matter, that any living species is the ancestor of any type of other living species. A human may be related to blood relatives, such as cousins, aunts, and also uncles, because she shares v them one or much more common ancestors, such as a grandparent, or great-grandparent. But those cousins, aunts, and uncles room not she ancestors. In the very same way, humans and also other life primates are related, yet none of this living loved ones is a human being ancestor.
*
Learn MoreAll in the FamilyLearn MoreJane Goodall video Clip watch in QuickTime or RealPlayer
4. What is a species?
Members of one varieties do not typically interbreed v members that other types in nature. Sometimes, members of various species, such as lions and tigers, can interbreed if kept together in captivity. But in nature, geographic isolation and also differences in behavior, together as an option of habitat, save these kinds of carefully related animal types apart. Similarly, carefully related species of plants can sometimes be hybridized by horticulturists, however these hybrids are rarely found in nature. A species, then, is defined by scientific research as a team of interbreeding or perhaps interbreeding populaces that is reproductively secluded from other such groups.
Learn MoreAn beginning of Species
5. What perform genes have to do through evolution?
Genes space the sections of an organism"s DNA that lug the password responsible for building that biology in a very particular way. Genes -- and, thus, the traits they code for -- are passed from parent to offspring. Indigenous generation to generation, well-understood molecular mechanisms reshuffle, duplicate, and also alter gene in a means that produces hereditary variation. This sports is the raw product for evolution. Learn MoreEvolution since Darwin
6. What function does sex pat in evolution? sexual reproduction enables an organism to combine fifty percent of its genes with half of one more individual"s genes, which means new combine of gene are produced every generation. In addition, when eggs and sperm space produced, hereditary material is shuffled and recombined in means that produce new combinations that genes. Sex-related reproduction thus increases genetic variation, which increases the raw material on which natural choice operates. Genetic variation in ~ a types -- likewise known as genetic diversity -- increases a species" chance for adjust over succeeding generations.
*
Learn MoreThe advantage of Sex
7. Is development a random process?
advancement is no a arbitrarily process. The genetic variation on which natural selection acts may occur randomly, however natural choice itself is not random in ~ all. The survival and also reproductive success the an separation, personal, instance is straight related come the means its inherited traits duty in the context of its neighborhood environment. Even if it is or not an individual survives and also reproduces depends on whether it has genes that produce traits that room well adapted to that is environment.
*
Learn MoreLife"s grand Design
8. Space evolution and "survival the the fittest" the same thing?
Evolution and "survival the the fittest" room not the same thing. Advancement refers to the cumulative alters in a populace or varieties through time. "Survival that the fittest" is a famous term that describes the process of herbal selection, a device that cd driver evolutionary change. Natural choice works by giving individuals who are much better adapted to a given set of environmental problems an benefit over those that are not too adapted. Survival of the fittest usually makes one think of the biggest, strongest, or smartest people being the winners, yet in a organic sense, evolutionary fitness describes the capability to endure and blee in a certain environment. Popular interpretations the "survival of the fittest" commonly ignore the prestige of both reproduction and also cooperation. To survive however not pass on one"s genes to the next generation is to be biologically unfit. And many organisms room the "fittest" since they cooperate with various other organisms, rather than completing with them. Learn MoreAdaptation and Natural Selection
9. How does natural selection work? In the process of herbal selection, people in a populace who space well-adapted to a particular collection of environmental conditions have an benefit over those who space not so well adapted. The benefit comes in the kind of survival and also reproductive success. Because that example, those people who are better able to find and use a food source will, ~ above average, live longer and produce more offspring than those that are less successful at finding food. Inherited characteristics that increase individuals" fitness room then pass to their offspring, thus giving the offspring the very same advantages.
Learn MoreAn beginning of species
10. Just how do biology evolve?
Individual organisms don"t evolve. Populations evolve. Because individuals in a population vary, some in the populace are much better able to survive and reproduce provided a particular set of ecological conditions. This individuals generally survive and produce an ext offspring, thus passing their valuable traits on to the next generation. End time, the populace changes.
*
Learn MoreSex and also the solitary Guppy
11. Does development prove over there is no God?
No. Many people, from evolutionary biologist to important spiritual figures like Pope man Paul II, compete that the time-tested theory of development does no refute the presence of God. They acknowledge that evolution is the description of a process that governs the advancement of life ~ above Earth. Like other scientific theories, consisting of Copernican theory, atom theory, and also the germ theory of disease, evolution deals just with objects, events, and processes in the material world. Science has actually nothing come say one method or the other about the visibility of God or around people"s spirituality beliefs.

See more: Shall We Date? Princess Arthur Merlin Merlin (Series 5)

*
Learn MoreScience and Faith
Videos | Web Activities | Site Guide | About the Project | FAQ | Glossary | Site Map | Feedback | Help | Shop
© 2001 WGBH Educational foundation and clean Blue sky Productions, Inc. All rights reserved.