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The Evidence for Evolution

The Evidence for Evolution

Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.

Convergent Evolution

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.

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What is Natural Selection?

Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.

Eukaryotic Evolution

Eukaryotic Evolution

The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
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Global Climate Change

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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.

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No selection for change in polyandry under experimental evolution.

Andreas Sutter^1,2, Laura M Travers^1,2, Melanie Weedon¹

¹Centre for Ecology and Conservation, College of Life and Environmental Sciences, University of Exeter, Penryn, UK.

Journal of Evolutionary Biology

|April 11, 2019

Summary

This summary is machine-generated.

Female polyandry (multiple mating) variation is key in evolution. This study found polyandry levels remained stable in fruit flies, with no clear fitness benefits, questioning its importance for female reproductive success.

Keywords:

Drosophila pseudoobscura balancing selection directional selection genetic variation isofemale lines monandry multiple mating

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Area of Science:

Evolutionary Biology
Behavioral Ecology
Genetics

Background:

Mating system variation, particularly female polyandry (multiple mating), is a central question in evolutionary biology.
Understanding the drivers and maintenance of polyandry variation across different levels (individual, population, species) is crucial but remains limited.
Existing research is often biased by studies enforcing monandry, hindering a full understanding of polyandry's evolutionary role.

Purpose of the Study:

To investigate the evolutionary stability and fitness consequences of genetic variation in female polyandry.
To determine if selection actively maintains or if neutral processes shape polyandry variation.
To assess the impact of polyandry on female fecundity and overall fitness in Drosophila pseudoobscura.

Main Methods:

Experimental evolution over seven generations using isofemale lines of Drosophila pseudoobscura with initially high or low polyandry levels.
Tracking of polyandry levels across replicate populations under controlled conditions.
Direct fitness and fecundity comparisons between evolved and ancestral female genotypes.

Main Results:

Polyandry levels remained relatively stable, reflecting the initial frequencies established in the experimental populations.
No significant fitness differences were detected between genotypes with high versus low polyandry.
No signature of balancing selection was observed, and female fecundity was unaffected by polyandry levels.

Conclusions:

The stability of polyandry levels and the absence of differential selection suggest that polyandry may not be under strong selection related to female fitness.
These findings challenge the assumed importance of polyandry for female fitness, particularly in the context of observed genetic variation.
Further research is needed to explore potential subtle or indirect benefits and costs of polyandry that were not detected in this study.