In broad terms, modern evolutionary theory builds on the synthesis of Darwinís ideas of natural selection and variation and Mendel's model of genetic inheritance accomplished through J.B.S. Haldane, R.A. Fisher and Sewall Wright in 1930-32.
The main realization of the neo-Darwinian synthesis is always that natural selection is best understood to be performing on variation between elements that persist. Therefore, the chromosome does not persist, however is scrambled with components of its paired partner in the procedure of meiosis. This is repeated for every generation. What persists is the allele, which could be defined simply like a stretch of genetic material that is not split up in the shuffle of meiosis, however is transmitted intact to the gamete and therefore into the next generation.
The selective survival of individual organisms because of functional differences and therefore the differential transmission to the next generation of alleles, is a pervasive force framing the trajectories of evolutionary lineages.
Teaching the theory of Evolution to children can be quite difficult. Learning Evolution is helpful because of its significance in medical research, in the Life Sciences and also in the social sciences. It has numerous practical applications. Yet you can find not as many Evolution learning resources accessible that are targeted at younger kids as there needs to be. The following is a summary of educational and fun resources with regard to young children.
Darwin and Evolution for Children traces the transformation of a privileged and somewhat scatterbrained youth to the great thinker who suggested the revolutionary theory of evolution. Kids also learn how fossils are developed, trace genetic traits via their family trees and discover if acquired traits are passed along to long term generations. By motivating children, teachers and parents to define the differences between beliefs and theories, opinions and facts, Darwin and Evolution for Children does not shy far from a theory that carries on to spark heated public debate greater than a century after it had been first proposed.
In daily usage, theory usually refers to a speculation or a hunch. When individuals say, I have a theory about why that happened, they tend to be drawing a conclusion according to fragmentary or inconclusive evidence. The formal scientific definition of theory is very different from the daily meaning of the word. It describes a comprehensive explanation of some factor of nature that is supported by a huge body of evidence.
Numerous scientific theories are extremely well-established that no fresh evidence is likely to modify them substantially. For instance, no new evidence will show that the planet does not orbit round the sun (heliocentric theory) or that life are not made from cells (cell theory), that matter is not made up of atoms or that the surface of the planet is not separated into solid plates that have transferred over geological timescales (the theory of plate tectonics).