which statements correctly describe factors that are necessary for evolution to occur?
2905
Four (4) conditions for natural selection. Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.
887925
['Non-adaptive traits. -vestigial traits. ... ', 'Genetic constraints. -gene linkage (no crossover possible; indirect selection due to proximity to selected genes) ... ', 'fitness trade-offs. ... ', 'historical constraints.']
804432
He explained how traits are passed from parents to offspring. He proposed that natural selection is the primary mechanism of evolution. ... Since more offspring are produced than an environment can support, organisms within a population must compete for resources to survive.
973084
Gradualism says that evolution is a low, steady change. Punctuated equilibrium states that rapid evolution of a species comes about by the mutation of a few genes. Discuss how gradualism and punctuated equilibrium describe the rate of evolution. ... Explain the importance of fossils as evidence of evolution.
993570
New traits can also come from transfer of genes between populations, as in migration, or between species, in horizontal gene transfer. Evolution occurs when these heritable differences become more common or rare in a population, either non-randomly through natural selection or randomly through genetic drift.
847648
There are four principles at work in evolution—variation, inheritance, selection and time. These are considered the components of the evolutionary mechanism of natural selection. ... Selection Some individuals have inherited character (genes) that allows them to better survive or produce more offspring.
1294664
An organism's DNA affects how it looks, how it behaves, and its physiology. So a change in an organism's DNA can cause changes in all aspects of its life. Mutations are essential to evolution; they are the raw material of genetic variation. Without mutation, evolution could not occur.
1011454
Natural selection is when an organism has more offspring because of a favored genetic trait. Natural selection is the process by which traits in a species become more or less common over time. ... A mutation or mutations need to occur so individuals can have different traits.
377690
Genetic variation is essential for natural selection because natural selection can only increase or decrease frequency of alleles that already exist in the population. Genetic variation is caused by: mutation. random mating between organisms.
682928
Natural selection is a simple mechanism that causes populations of living things to change over time. In fact, it is so simple that it can be broken down into five basic steps, abbreviated here as VISTA: Variation, Inheritance, Selection, Time and Adaptation.
586832
['structural similarities. factors that help determine evolutionary relationships: these similarities show that species are closely related and may have evolved from a common ancestor.', 'breeding behavior. ... ', 'geographical distribution. ... ', 'chromosome comparison. ... ', 'biochemistry. ... ', 'phylogeny. ... ', 'ancestor. ... ', 'cladistics.']
963963
What is true of microevolution? It is evolution that involves only tiny changes to DNA, such as point mutations, producing only small (if any) changes to phenotype. It is evolution that influences only a small subset of the populations that comprise a species.
1220498
["Nutrients. Nutrients are needed for the organism's growth and development.", "Temperature. If the temperature isn't ideal, organisms lose their ability to reproduce and survive.", 'Light.']
812739
['abiotic factors: moisture, temperature, sunlight, nutrients.', 'biotic factors: competition, mutualism, commensalism, predation/parasitism.']
464221
There are three conditions for natural selection: 1. Variation: Individuals within a population have different characteristics/traits (or phenotypes). 2. Inheritance: Offspring inherit traits from their parents.
584070
Natural selection, genetic drift, and gene flow are the mechanisms that cause changes in allele frequencies over time. When one or more of these forces are acting in a population, the population violates the Hardy-Weinberg assumptions, and evolution occurs.
103196
['It must be stable.', 'It must be capable of being expressed when needed.', 'It must be capable of accurate replication.', 'It must be transmitted from parent to progeny without change.']