Evolutionary biologist

An evolutionary biologist investigates inherited change and the historical relationships of organisms. Work can combine genetics, ecology, paleontology and experiments, connecting mechanisms such as natural selection and genetic drift to patterns of diversity.

A central task is separating competing causes: a shared allele might reflect common descent, gene flow or repeated mutation. Which comparison is informative depends on the biological question and the history being tested.

G. A. Parker coauthored a 1972 evolutionary model for the origin of anisogamy, the difference between small and large gametes. The model connected the number of gametes a producer can make with the resources available to a resulting zygote. Producing many small gametes can improve opportunities for fusion, whereas larger gametes can improve provisioning; these pressures need not favor one intermediate size.^[ref]

The contribution made the origin of two gamete-size strategies a problem in natural selection. It explained a possible mechanism under explicit reproductive assumptions, rather than making every observed sex difference a necessary consequence of anisogamy.

Daniel G. Blackburn studied the evolution of viviparity and maternal provisioning in reptiles. A 1984 paper described the skink Mabuya heathi, whose very small eggs and specialized placenta indicated extensive nutrient transfer during pregnancy. Most embryonic growth occurred late in pregnancy, when placental specialization was pronounced.^[ref]

The comparison is useful because live birth and the source of embryonic nutrition are different traits. An embryo can be retained in its mother while relying mainly on yolk; this reptile instead exhibited substantial maternal provisioning. Similar physiological problems can therefore favor comparable reproductive specializations in separate evolutionary lineages.

Motoo Kimura developed mathematical approaches to population genetics and the neutral theory of molecular evolution. His 1968 paper argued that observed molecular substitution rates would be difficult to explain if every substitution represented favorable natural selection. Many changes could instead have little effect on biological fitness and spread through genetic drift.^[ref]

A simple neutral calculation makes the idea concrete. In a diploid biological population of $N$ individuals, $2N\mu$ neutral copies arise per generation when the mutation rate is $\mu$, and each has fixation probability $1/(2N)$. Their product is $\mu$: under these assumptions, the substitution rate equals the neutral mutation rate. This distinguishes molecular change from inevitable adaptive improvement.

Evolutionary biologist whose research includes plant speciation and the evolution of biodiversity.

Evolutionary biologist whose marine research includes species delimitation and divergence of snapping shrimp lineages.

August Weismann investigated heredity and argued for distinguishing changes transmitted through the reproductive lineage from changes acquired by the rest of the body. His essays helped frame questions about the relationship between biological development and inherited variation. The collected essays record stages in his changing views, so their arguments should be read with their individual dates rather than treated as a single unchanging theory.^[ref]

Jean-Baptiste Lamarck proposed a theory of evolution in which changed circumstances affect needs and habits, use and disuse alter structures, and acquired modifications can be transmitted. His account is historically important for its attempt to explain biological transformation through causes, while its proposed transmission mechanism should be distinguished from modern evidence about genetics.^[ref]

Alfred Russel Wallace independently developed an explanation of evolution through natural selection. His 1858 essay argued that variants could depart from an original type through differential persistence and reproduction. The essay was presented alongside writings by Charles Darwin, making the relationship between their independently developed ideas part of the publication history.^[ref]

Evolutionary biologist whose explanation of natural selection linked inherited genetic variation to differential reproduction.

An evolutionary biologist who tested the effects of relatedness and the scale of competition on cooperative siderophore production in bacteria.^[ref]

Barbara McClintock (1902–1992) investigated inherited variation in maize, combining chromosome observations with the transmission of visible traits. Her work identified mobile controlling elements, now understood as transposable elements, showing that genetic regulation need not be represented by permanently fixed gene positions.^[ref]

Coloured and uncoloured sectors in maize tissues provided an observable record of changes occurring during biological development. Connecting those patterns to genetic and cytological evidence made movement and regulation experimentally testable. She received the 1983 Nobel Prize in Physiology or Medicine for the discovery of mobile genetic elements.^[ref]

An evolutionary biologist who studied microbial contributions to cytoplasmic incompatibility, using reciprocal insect crosses and microbial manipulation.^[ref]

An evolutionary biologist who investigated microorganisms associated with chromosome destruction and reproductive isolation in insects.^[ref]

An evolutionary biologist who coauthored an interpretation of genomic imprinting through conflict over growth regulation; the primary publication credits the author with these initials.^[ref]

An evolutionary biologist who developed a conflict-based interpretation of genomic imprinting, asking why maternally and paternally inherited variants can favour different growth outcomes.^[ref]

An evolutionary biologist who investigated parent-of-origin effects of disrupting the mouse insulin-like growth factor II gene, connecting genomic imprinting to offspring growth.^[ref]

An evolutionary biologist who coauthored work on centromere-associated meiotic drive in monkeyflowers, comparing female transmission advantage with male fertility costs.^[ref]

An evolutionary biologist who investigated centromere drive in monkeyflowers, testing how a transmission advantage can coexist with a fertility cost.^[ref]

An evolutionary biologist who tested whether infected monarch mothers change oviposition choices in ways associated with reduced parasite growth in offspring.^[ref]

An evolutionary biologist who investigated disease resistance in honeybee colonies bred for hygienic behaviour, combining brood assays with pathogen challenge.^[ref]

An evolutionary biologist who investigated genetic control of butterfly wing patterns, linking Optix to repeated changes in mimetic colour patterns.^[ref]

An evolutionary biologist who tested Müllerian mimicry in the field through butterfly release experiments with different local co-models and release densities.^[ref]

An evolutionary biologist who investigated genetic variation in Drosophila foraging, combining behavioural measurements, kinase activity and transgenic rescue; the source credits these initials.^[ref]

An evolutionary biologist who investigated the genetic basis of stronger mate discrimination, testing speciation through reinforcement.^[ref]

An evolutionary biologist who investigated geographic differences in mate discrimination in Drosophila, testing evidence for reinforcement.^[ref]

An evolutionary biologist who used ultraconserved genomic elements to investigate turtle relationships and test their placement relative to archosaurs.^[ref]

An evolutionary biologist who used molecular evidence to test chordate relationships, supporting tunicates as the closest living relatives of vertebrates.^[ref]