BRIDGES’ THEORY OF SEX DETERMINATION IN DROSOPHILA
Introduction to Drosophila Sex Determination Drosophila melanogaster, commonly known as the fruit fly, has been a model organism for genetic studies for over a century. One of the fundamental aspects of Drosophila genetics is its sex determination system. In Drosophila,…
INSIGHTS FROM THE NEUTRAL THEORY OF MOLECULAR EVOLUTION
The neutral theory of molecular evolution, proposed by Motoo Kimura in the late 1960s, suggests that the majority of evolutionary changes at the molecular level are caused by random genetic drift of mutant alleles that are selectively neutral. This theory…
A CLOSER LOOK AT THE CLONAL SELECTION THEORY
The clonal selection theory is a fundamental concept in immunology that explains how the immune system responds to antigens. Proposed by Australian immunologist Frank Macfarlane Burnet in 1957, the theory revolutionized the understanding of immune responses and laid the groundwork…
POSTULATES OF KINETIC THEORY OF MATTER
The kinetic theory of matter is a scientific theory that explains the behavior of matter in terms of the motion of its particles. The theory is based on several postulates: 1) Matter is made up of tiny particles: According to…
LIMITATIONS OF DALTON’S THEORY
Dalton’s atomic theory was proposed by John Dalton in 1808, and it was a significant advancement in the field of chemistry. The theory was based on several observations and experiments that Dalton conducted. Here are the main postulates of Dalton’s…
DARWIN’S THEORY AND MODERN THEORIES OF ORGANIC EVOLUTION
Charles Darwin, a British biologist, in 1859 propounded a theory of organic evolution by Natural Selection leading to the origin of species. His theory of natural selection is as follows: 1) Overproduction: All living organisms produce more offspring than can…
LAMARCK’S THEORY OF ORGANIC EVOLUTION
Jean Baptiste Lamarck, a French biologist was one of the first biologists to put forward the theory of organic evolution in 1801. His idea of organic evolution was hinged on three theories. 1) The theory of need This states that…
TEST QUESTIONS AND ANSWERS ON ROCK (PART 1)
Define the term sedimentary rock and describe any two processes of its formation Sedimentary rocks are rocks formed from sediments deposited either by water, wind or ice. These sediments are formed in layers or strata, one on top of the…
Study Guide
