Directional selection - Study guides, Class notes & Summaries

Biology 1108 Unit 1 EXAM Questions and Answers 100% Pass The term "n" refers to the size of a population, that is, the number of individuals in that population. In general, in a sample of n individuals, the frequency of an allele is: A)the number of occurrences of the allele. B)the number of occurrences of the allele divided by n. C)the actual value of n D)the number of occurrences of the allele divided by twice the number of individuals in the sample (2n). E)twice the number of occur...

BIO 182 Exam 2 Questions And Answers 100% How many modes of selection are there? 3 What are the modes of selection? Stabilizing selection, directional selection, and disruptive selection Stabilizing Selection The mean of the trait remains similar over time but the standard deviation decreases Directional Selection The mean phenotype shifts in a particular direction Disruptive Selection The standard deviation of the trait increases as individuals with the mean value disappear. Stabil...

Interpret this statement: Extinct fossil species are typically succeeded by similar living species - Answer Extinct and living forms represent ancestors and descendants Which is an example of developmental homology a) gene content b) similar organismal structures c)vestigial traits d) similar embryonic traits - Answer d) Which is not one of Darwin's 4 Postulates: a) Individuals in a population vary in their traits b) These differences are not heritable; they are not passed onto offs...

Experiment - Answer-test of a hypothesis. It can be observational (observe the system) or manipulative (perturb the system). The experimental method is the scientific method. Hypothesis - Answer-universal proposition that suggests explanations for some observed ecological situation. Model - Answer-verbal or mathematical statement of a hypothesis. Principle - Answer-universal statement that we all accept because they are mostly definitions, or are ecological translations of physical-chemic...

A ___ is a community along with its physical environment. Ecosystem By definition, a _____ consists of individuals of the same species that are living in the same area at the same time. Population Parasitic relationships fall under the category of _____. Consumption If two species of birds are interacting, and both are experiencing a negative effect on fitness, which type of interaction is occurring? Competition ____ is defined as any change in allele frequency in a population that is due to...

AP Bio Evolution Latest Update Already Graded A adaptive radiation rapid speciation of a single or a few species to fill many ecological niches allopatric speciation when populations physically separated by an extrinsic barrier evolve so that if the barrier breaks down, they can't breed artificial selection the intentional breeding of certain characteristics over others balanced polymorphism natural selection maintaining polymorphisms in a population bottleneck effect an evol...

Allele - Gene for particular trait (T) (t) artificial selection - selective breeding of plants and animals to promote the occurrence of desirable traits in offspring Base pairing in DNA - Adenine, Thymine, Guanine, Cytosine Base pairing in RNA - Adenine, Uracil, Guanine, Cytosine Basic monomers and polymers of nucleic acids - bottleneck effect - A change in allele frequency following a dramatic reduction in the size of a population Central Dogma - DNA-transcription-RNA-translation-protei...

World Event taking place due to negative human impact on biodiversity - Going into the world's 6th mass extinction event. current extinction rates are between 10 and 100 times higher than those estimated from the fossil record Vast Number in species of life - There are between 1.5 and 2 million named species of living things on earth. Plants-300,000 Fungi-100,000 Bacteria and Protista-100,000 Vertebrates-50,000 Insects- 950,000 Ecosystem Services - Something such as oxygen, fresh water, o...

WSU Anthropology 101 Anthropology - correct answer The scientific study of human beings, looking at how cultures are dif/similar Cladogenesis - correct answer Speciation through branching so two or more species are formed Anagenesis - correct answer directional shift in a populations average characteristics (straight line) Charles Darwin - correct answer "on the origin of species" 1800s, HMS Beagle, Darwinnian fitness - correct answer the ability of an individual to survive and re...

Which of the following is not an observation or inference on which natural selection is based? a. There is heritable variation among individuals. b. Poorly adapted individuals never produce offspring. c. Species produce more offspring than the environment can support. d. Individuals whose characteristics are best suited to the environment generally leave more offspring than those whose characteristics are less well suited. e. Only a fraction of an individual's offspring may survive. - b. P...