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Alison spends the day playing tennis in hot weather and she drinks very little.What effect would her day's activities have on the volume and compostion of the urine she produces?
A swimming pool measuring 50 m long and 20 m wide is filled with water to a depth of 3 m. The density of the population of bacteria in water is 2.5 x 10 6 bacteria / m3. How many bacteria are there in the pool? (4 pts)
Assumes a study on a rodent species over an area of 120 ha (1 ha = 10,000 m2). It is found that rodents live only in scattered areas that account for a quarter of the region's area. A first sample of 200 individuals is captured, tagged and released. Later, a second sample of 200 individuals is captured. It is then observed that 20% of the animals of the first sample have been recaptured. (Answer the following questions by showing your calculations.) (5 pts)
A) Using these data, estimate the size of the total population.
B) What is the density of the rodent population (in individuals per hectare)?
C) What is the method of distribution of rodents?
A) Using these data, estimate the size of the total population.
B) What is the density of the rodent population (in individuals per hectare)?
C) What is the method of distribution of rodents?
Suppose qu'on effectue une étude sur une espèce de rongeurs sur une superficie de 120 ha (1 ha = 10 000 m2). On constate que les rongeurs vivent uniquement dans des régions dispersées qui représentent un quart de l'aire de la région. On capture un premier échantillon de 200 individus, on les marque et on les rel che. Plus tard, on capture un deuxième échantillon de 200 individus. On constate alors que 20 % des animaux du premier échantillon ont été recapturés. (Réponds aux questions suivantes en montrant tes calculs.) (5 pts)
a) À l'aide de ces données, estime la taille de la population totale.
b)Quelle est la densité de la population de rongeurs (en individus par hectare)?
c)Quel est le mode de distribution des rongeurs?
a) À l'aide de ces données, estime la taille de la population totale.
b)Quelle est la densité de la population de rongeurs (en individus par hectare)?
c)Quel est le mode de distribution des rongeurs?
1. What is a R strategy species? Give a few examples. (4 pts)
2. What is a K-strategy species? Give a few examples. (4 pts)
3. What are the respective advantages and disadvantages of both strategies? Give a few examples. (8 pts)
4. What type of survival curve characterizes R strategy species? (1 pt)
5. What type of survival curve characterizes K-strategy species? (1 pt)
6. Many threatened species are K-based organisms. Gives two reasons why these species may be more fragile than others. Explain your reasons. (4 pts)
7. Gives examples of technological innovations that have allowed humans to increase K, the limiting capacity of the environment. (3 pts)
2. What is a K-strategy species? Give a few examples. (4 pts)
3. What are the respective advantages and disadvantages of both strategies? Give a few examples. (8 pts)
4. What type of survival curve characterizes R strategy species? (1 pt)
5. What type of survival curve characterizes K-strategy species? (1 pt)
6. Many threatened species are K-based organisms. Gives two reasons why these species may be more fragile than others. Explain your reasons. (4 pts)
7. Gives examples of technological innovations that have allowed humans to increase K, the limiting capacity of the environment. (3 pts)
Sickle cell anemia (Sickle cell anemia) is an inherited recessive blood disorder characterized by chronic hemoglobin anemia, the sixth amino acid of the β chain of hemoglobin (glutamic acid) being Substituted by valine. This disease is common in populations whose ancestors come from sub-Saharan Africa. In an individual, the presence of two ss alleles gives the disease. An Ace individual is a carrier and an AA individual is normal. If 9% of the African population comes into the world with this disease (ss), calculates the percentage of the population that would carry the disease or As heterozygotes.
It has been found that some people have inherited resistance to the human immunodeficiency virus, because the gene that codes for the CCR5 receptor undergoes a mutation (lack of 32 nucleotides). This mutation of CCR5 produces a shorter receptor, which prevents the virus from binding to macrophages. In one study, individuals homozygous for the mutant allele resisted infection despite the fact that they were repeatedly exposed to the immunodeficiency virus. In individuals tested with a copy of the mutant allele, AIDS occurred two to three years later than in those without a copy of the mutant allele. The mutant allele is the most common in Caucasian individuals. Calculates the percentage of the American white population that would be heterozygous for the mutant allele CCR5? Show your work and formulas.
analysing a cross it was observed that the frequency of recombination between genes A and B was 98%. Comment upon the distance between the two genes
Photosynthesis and cellular respiration are related processes. What do these processes have in common?
describe aerobic respiration under the headings:
The citric acid cycle
The electron transport chain
The citric acid cycle
The electron transport chain
