Physical anthropologists

The gene for sickle cell anemia is found at a rate of 10 percent in West African blacks, 0 percent in American whites, and 5 percent in the descendants of West African blacks and American whites. Which force of evolution explains this pattern for the gene? gene flow How did Lamarck contribute to the theory of evolution? He proposed the first serious model of how traits are passed on from parent to offspring through inheritance of acquired characteristics, though that idea turned out to be incorrect. Thomas Malthus's contribution to natural selection is the: observation that an abundance of food would allow a population to increase geometrically and indefinitely, but there simply is not enough food, so populations are limited by food supply. Charles Darwin's book On the Origin of Species (1859) was considered an important contribution to modern science because it: synthesized information from diverse scientific fields in order to document evolutionary change The four forces of evolution are gene flow, genetic drift, mutation, and natural selection. Darwin observed that adaptations: were physical traits that enhanced survival and reproduction. The study of taxonomy was enriched by the work of Carolus Linnaeus. Which of the following tenets are part of Darwin's theory of natural selection? All of the choices are correct. The scientist whose work provided the foundation for later understandings of genetics was: Gregor Mendel. Mendel's plant experiments demonstrated that: traits are passed on from parent to offspring as discrete units. The specific shape of DNA is known as the double helix. What were the three key observations made by Darwin that allowed him to deduce that natural selection is a primary driver of evolution? Organisms produce more offspring than survive, variation exists among members of populations, and advantageous variations increase in relative frequency over time. Gene flow differs from genetic drift because it is the: spread of new genetic material from one gene pool to another. The presence of a recessive allele: can be masked in the phenotype. The expression of polygenic traits is: determined by genes at several loci.