What does the term genome mean? (compare and contrast to genotype & genome) What does it mean to change the genotype of a population? What is an allele? Which is more likely to be lost from a population, a dominant gene or a recessive gene? Why might the genome of a population change?

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A genome is a full set of chromosome; all the inheritable traits of an organism. A genotype is the genetic makeup of an organism or group of organisms with reference to a single trait, set of traits, or an entire complex of traits. Genetic variation describes naturally occurring genetic differences among individuals of the same species. This variation permits flexibility and survival of a population in the face of changing environmental circumstances. Consequently, genetic variation is often considered an advantage, as it is a form of preparation for the unexpected. An allele is any of several forms of a gene, usually arising through mutation, that are responsible for hereditary variation. A dominant gene would  be more likely to be lost from a population. Because a genetic population is described as the sum of gene (or allelic) frequencies for all the genes represented by that population, it follows that for evolution of a species to occur the gene frequencies of that population must undergo change.

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