Allelic Diversity
Allelic Diversity - Related Videos
06:40
Plant Diversity - Concepts
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2019
From Water to Land Kingdom Plantae first appeared about 410 million years ago as green algae transitioned from water to land. Though challenging, this transition benefited early colonizers in several ways. Initially, most living organisms (including plants and animals) were ocean dwelling, making aquatic environments crowded and highly competitive. In contrast, land was a relatively uncolonized environment with ample resources and little to no predators or competitors. Terrestrial environments...
05:49
Community Diversity - Concepts
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2019
Populations do not live in isolation; thus, every population interacts with others in certain ways. These interactions give rise to a network of populations. Hence, an ecological community is composed of such population networks of various species interacting with each other within the same area. These biological, or biotic, components may also closely interact with non-living, or abiotic, components, forming an ecosystem. Ecosystems may be as small as the microbial communities inside the human...
13:04
Community Diversity - Student Protocol
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2019
Measuring Biodiversity in Areas with Different Disturbance Regimes ExpandNOTE: In this experiment, you will compare the biodiversity in a less disturbed area against a more highly disturbed area. HYPOTHESES: The experimental hypothesis could be that a less disturbed area will contain a greater diversity of species than a highly disturbed area. The null hypothesis could be that there will be no difference in diversity between less disturbed and highly disturbed areas. To begin, divide into...
01:09
Community Diversity - Instructor Prep
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2019
Setting up for the Lab and Choosing Field Sites ExpandBefore the experiment, first ensure that the student computers have Microsoft Excel or Google Sheets installed. If using Excel, make sure the data analysis tool pack is loaded. Next, you will need to identify the two fields where the students will take measurements. Both fields should ideally have lengths in any direction of at least 30 meters. One field should be a shrubby or weedy field that has not been mowed recently. The second field...
02:19
Multiple Allele Traits
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2021
For the same gene multiple alleles can interact to influence phenotypes like the shape and protein composition of an individual cells.By studying allele interactions on the molecular and cellular levels researchers can understand the resulting phenotypes and complications of human conditions like sickle cell trait, improving treatment.The ABO blood group system is a common example of multiple alleles in humans. This system includes three alleles called IA, IB, and i alleles, which combine in...
FAQs
Mutation introduces new DNA sequence variants, creating alleles that did not previously exist in a population. Recombination reshuffles existing genetic material, producing new allele combinations, while gene flow moves alleles between populations. Together, these processes expand or redistribute the genetic variation available for populations to respond to changing conditions.
Natural selection can increase the frequency of alleles associated with greater reproductive success, whereas genetic drift changes allele frequencies through chance. Drift may reduce variation, especially when some alleles become lost, while selection can favor particular variants. Their effects help determine whether diversity is maintained, increased in frequency, or diminished across generations.
Population history influences which alleles are present and how common they are. Past gene flow can connect populations, while historical separation can contribute to differences in their allele frequencies. Examining these patterns helps researchers distinguish variation associated with population structure from changes shaped by selection, drift, or other evolutionary processes.
Researchers can compare allelic variation and allele frequencies among populations or across biological contexts to investigate patterns consistent with adaptation. Variation provides the genetic material on which natural selection can act, while differences in frequency may indicate that populations have experienced distinct environmental or evolutionary pressures. These analyses help explain how populations respond to change.
Patterns of allele variation can show whether populations share genetic material or differ in their genetic composition. Greater similarity may reflect gene flow or shared population history, whereas differences can indicate separation or distinct evolutionary experiences. This information helps biologists characterize population structure and understand how populations are related.
Conservation genetics uses allelic diversity to identify whether populations have lost genetic variation and may therefore have reduced genetic potential. Assessing variation can guide efforts to maintain populations with enough diversity to respond to environmental change. The resulting information supports decisions focused on preserving evolutionary capacity rather than only maintaining population numbers.