Final Exam JPG Converted.pdf Sigr 28. The sperm count of the human population of developed societies has million per ml to 50 million per ml in recent years. This is an example of A. directional selection B. disruptive selection C. sexual selection D. stabilising selection 29. Which of the followings is TRUE about directional selection? A. Selection pressure against organisms with one of the extreme phenotypes. B. It usually occurs in response to a stable environment. C. The mean value of the population graph remains unchanged. D. Example for direction selection is the birth weights of human babies.
Evolutionary Genetics
Evolution is known as continuous changes that occur to adjust organisms in their changing environment over many generations. Various theories have been proposed to illustrate the origin of life and organic evolution. The most accepted one is the theory of natural selection by Charles Darwin. According to his postulate, organisms undergo a struggle for existence due to overproduction. To survive in nature, they acquire variations. The inheritable variations are selected by nature, and it leads to the survival of the fittest.
Phenotype Frequency
The majority of populations have a certain degree of variation in their genetic pools. Scientists can predict the genetic variation happening over time by measuring the amount of genetic variation in a population and these predictions assist them in gaining important insights into the processes that allow organisms to adapt to the environment or to develop into new species over generations. This process is referred to as the process of evolution.
Hardy Weinberg Equilibrium
The frequencies of allele and genotype were maintained constant from one generation to another due to the absence of other evolutionary forces. It is otherwise called the Hardy Weinberg principle the field of population genetics.
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