Step-by-Step Biology Tutorials for Easy Learning

The potential power of directional selection cannot be demonstrated in a real population if?
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How many gene pairs are involved in generating a typical 1:8:28:56:70:56:28:8:1 ratio in the f2 generation of an experimental cross? group of answer choices
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Calculate the fixation index in the subpopulation relative to the total population based on the information provided.
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Which product is a nontimber forest product? a. turpentine turpentine b. charcoal charcoal c. lumber lumber d. paper
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a healthy man and a healthy (unaffected) woman have a son with lesch-nyhan syndrome, an x-linked recessive trait. what is the percent chance that this couple's daughter will have lesch-nyhan syndrome?
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cells in the visual cortex of the brain that fire selectively in response to specific visual features, such as lines oriented in a particular direction, are called:
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signaling activity of g proteins is controlled by gtpase activating proteins (gaps) and guanine exchange factors (gefs). what are the mechanisms by which gaps and gefs control g proteins?
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which of the following is the independent variable in this experiment? a) number of squirrels b) amount of time spent foraging c) species of predator d) presence of hawk sounds e) number of predators present
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it is estimated that one acre of forest can remove and store acres about 19,000 lbs of carbon dioxide from the atmosphere each year1. how many acres of forest would be needed to absorb your annual emissions of co2?
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what was the main result of the experiment that looked at the testing of nuclear weapons and cortical neurogenesis?
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Organelo presente en todos los moneras a. capsula b. mitocondrias c. ribosoma d. citoesqueleto
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A and b are two elements of period 3. a is metal and b is non-metal. they form compound c which is tetra atomic. what is the compound c ??
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Select the statement that best describes high sensitivity crp (hs-crp) testing?
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During which phase of mitosis do nuclear membranes form around two sets of chromosomes
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Two different bacterial samples, a and b, were inoculated onto eosin methylene blue (emb) agar. what can you conclude based on your observations?
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What are some of the different kinds of lipids? a) glycerophospholipids b) fats c) cellulose d) enzymes e) steroids f) waxes oils
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They have four children, none of whom have polydactyly. what is the probability their next child will have polydactyly?
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1. how is the process that generates energy in the sun's core different from an explosion caused by a chemical reaction? (1 point) i 2. how is energy transferred from the core of the sun to its surface? (1 point) 3. how is energy from the surface of the sun transferred to earth? (1 point) 4. what is the 11-year solar cycle? (1 point) 5. how does the solar cycle affect the amount of energy that earth receives from the sun? (1
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Hardening of the arteries results in _______ and deposition of plaques in the walls of the arteries results in
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Help please!! need asap select the correct answer from each drop-down menu. soil is a (blank) resource that can be used in a sustainable manner. fertility of soil can be sustained by protecting topsoil from (blank) and contamination. because soil fertility is replenished by decomposing organisms, it is necessary to enter sure that the natural life cycle of plants and wild animals is not disrupted. that is why ( blank) is an effective measure against land degradation. first tab answers are: non renewable or renewable second tab answers are: groundwater,erosion, or vegetation third tab answers are: lumbering, reforestation, or slash and burn
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If a cell is detected with non-replicated or damaged dna immediately before mitosis, what would be an efficient way to delay entry into mitosis until repairs to the dna has been made?
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If the phenotype reflects the activities of more than one gene, it is called a ______ trait.
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Genetic changes followed by selection are best described as the fundamentals of what process? a. reproduction b. genetic drift c. regeneration d. dna replication e. evolution
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