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This book was recommeneded for a prep/access course I took before uni. Prior to this course I had very little knowledge of biology not even to name simple organelles or domians of life. I found this book amazing as it covers so many topics and uses simple but yet informative text with many illustrations to help you understand further.
In the early 1800 s, French naturalist Jean Baptiste Lamarck suggested that the best explanation for the relationship of fossils to current organisms is that life evolves. He proposed that by using or not using its body parts, an individual may change its traits and then pass those changes on to its offspring. He suggested, for instance, that the ancestors of the giraffe had lengthened their necks by stretching higher and higher into the trees to reach leaves. Evaluate Lamarck's hypotheses from the perspective of present-day scientific knowledge.
Natural selection is sometimes described as "survival of the fittest." Which of the following best measures an organism's fitness?#N#a. how many fertile offspring it produces#N#b. how strong it is when pitted against others of its species#N#c. its ability to withstand environmental extremes#N#d. how much food it is able to make or obtain
Sickle-cell disease is caused by a recessive allele. Roughly one out of every 400 African Americans (0.25%) is afflicted with sickle-cell disease. Use the Hardy-Weinberg equation to calculate the percentage of African Americans who are carriers of the sickle-cell allele. (Hint: q 2 = 0.0025.)
It seems logical that natural selection would work toward genetic uniformity ; the genotypes that are most fit produce the most offspring, increasing the frequency of adaptive alleles and eliminating less adaptive alleles. Yet there remains a great deal of genetic variation within populations. Describe factors that contribute to this variation.