If an allele is recessive and lethal in homozygotes before they reproduce, a) the allele is present in the population at a frequency of 0.001 b) the allele will be removed from the population by natural selection in approximately 1,000 years
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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
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.
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.
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
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.
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.