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Where do variations in traits within a species originate from?
Variations in traits within a species originate from genetic mutations, environmental factors, and natural selection.
How does natural selection enhance or reduce tha variability of a species?
Natural selection 'weeds out' defective genes through successive generations - this both enhances a species chances of survival, and reduces variations in the species genetic make-up.
How does natural variation affect evolution?
Natural selection (the driving force of evolution) is the selection of genetic variations by how they effect the organism's chances of survival or reproduction. If they diminish it's chances, the organism or it's immediate offspring die and the gene is gone. If the genetic variations increase it's chances, then it survives. Without genetic variations there can be no evolution. Natural selection is the selection (by environmental pressures) of those variations.
What changes account for the ability of a species to evolve?
Changes in the genetic material of the species, such as mutations and genetic recombination, can create new variations. Natural selection acts on these variations, allowing individuals with advantageous traits to survive and reproduce, leading to evolution of the species over time.
What are the three measures to life's variations?
Adaptation: The ability to adjust to changing environmental conditions. Diversity: The range of different species and genetic variations within an ecosystem. Evolution: The process of natural selection and genetic change over time that leads to species' adaptation to their environment.
Which might a series of helpful variations in species result in?
natural selection
Why is DNA from two organisms of the same species polymorphic?
DNA from two organisms of the same species can be polymorphic due to variations in their genetic material, such as single nucleotide polymorphisms (SNPs) or insertions/deletions. These variations can arise from mutations, genetic recombination, or genetic drift, leading to differences in their genetic sequences that make each individual unique within the species.
Is natural selection a source of variation within species?
No, natural selection does not create variation within a species. Instead, natural selection acts on existing variations within a population, favoring traits that increase an individual's chances of survival and reproduction in a given environment. The variation itself arises from mechanisms such as mutations, genetic recombination, and gene flow.
Is it true that through natural selection harmful variations gradually accumulate in a species?
yes
Does natural selection lead to helpful or harmful variations that continue through the species?
HeLpful
How do different species come about?
Different species come about through the process of evolution, where genetic variations arise and those that provide a selective advantage are passed on to future generations. Over time, these variations can accumulate and lead to the development of new species with distinct characteristics and adaptations. This process is driven by changes in the environment, genetic mutations, and natural selection.
What genetic processes allow a species to change over time?
Genetic processes like mutation, genetic recombination through sexual reproduction, and natural selection are key factors that drive changes in a species over time. Mutations introduce new genetic variations, recombination shuffles existing genetic material, and natural selection favors traits that provide a survival or reproductive advantage in a specific environment. These processes collectively contribute to the genetic diversity and adaptation of species over generations.
