3) A locus controlling stripe intensity in snakes is known to possess two alleles that are codominant (both alleles are expressed in heterozygotes, and in this case, heterozygotes have a phenotype that is intermediate). This locus is also known to be X linked, with males being the heterogametic sex. A researcher wanted to determine if a population was randomly mating using stripe intensity. She enumerated phenotypes among 200 individuals in the population and obtained the following results. Phenotype # males # females Strong Stripe Intensity 40 16 Intermediate Stripe Intensity 0 48 Weak Stripe Intensity 60 36 Totals 100 100 200 A) Use a X* goodness of fit test to determine if genotype frequencies conform to those expected if the population is randomly mating, given that we know the locus is X linked. (Hints: think carefully about the number of classes and expected number of individuals within each class, and in this case, we lose 1 degree of freedom for using observed numbers of males, and another for using observed numbers of females in addition to those normally lost). Use the table of X critical values provided in the lecture notes. B) Perform a second goodness of fit test, but assume that the locus is NOT X linked C) What is one piece of evidence that can be used to determine if a locus is X linked?
Gene Flow
Gene flow, also known as gene migration, is the introduction of genetic material from a particular population to another population of the same species through interbreeding. For example, a bee facilitates its reproductive process by carrying pollen from one flower to another. The flow alters the composition of the gene pool of the receiving population. It introduces new alleles within the population and helps increase variability. This exchange of genetic material occurs through reproduction and brings about new combinations of traits into the population. Where human beings are concerned, actual migration of populations, whether voluntary or forced, brings about gene flow.
Population Biology
Population biology is the study of patterns in organism populations, specifically the growth and management of population size, population genetics, the evolution of life history, species interactions, and demography.
Speciation
The process of speciation involves the formation of new species during evolution. The new species evolve in such a way that both new and old species are not able to interbreed. Thus, speciation occurs when few members of one species get separated from the main species due to geographical, mechanical, or reproductive isolation. These separated members develop new traits that make them different from the main species. In other words, speciation could be defined as the absence of gene flow between two populations that become new species.
Allele Fixation
A gene is a unit of heredity and contains both physical and functional information that shapes an individual. Genes are made up of DNA (deoxyribonucleic acid), which carry genetic information from one generation to another, from one set of parents to their offspring, and so on. Every cell in a human body, or any living organism, has the same DNA, which implies that every cell in an individual’s body has all the information it needs to build and sustain the body!
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