Simpsons Diversity Index is a way to quantify the diversity…
Simpsons Diversity Index is a way to quantify the diversity of a community. The equation can be written as: D = N(N-1) / ∑ n ( n– 1) Where: D = Diversity index N = Total number of individuals of all species n = Number of individuals of a specific species Community A has 3 species (A, B, C). There are 5 individuals of each species. (N=15) Community B has 6 species (A, B, C, D, E). There are 3 individuals each of species A, B, and C. There are 2 individuals each of species D, E, and F. (N=15) Community C has 5 species (A, B, C, D, E). There are 3 individuals each of species. (N=15) What is the species diversity of Community B?
Read DetailsRegulation of gene expression occurs first at the DNA struct…
Regulation of gene expression occurs first at the DNA structural level, but it is even more tightly regulated at the transcription level. ______ are proteins that block the action of activators, either by blocking their access to the control elements, or binding the control element directly.
Read DetailsSimpsons Diversity Index is a way to quantify the diversity…
Simpsons Diversity Index is a way to quantify the diversity of a community. The equation can be written as: D = N(N-1) / ∑ n ( n– 1) Where: D = Diversity index N = Total number of individuals of all species n = Number of individuals of a specific species Community A has 3 species (A, B, C). There are 5 individuals of each species. (N=15) Community B has 6 species (A, B, C, D, E). There are 3 individuals each of species A, B, and C. There are 2 individuals each of species D, E, and F. (N=15) Community C has 5 species (A, B, C, D, E). There are 3 individuals each of species. (N=15) What is the species diversity of Community A?
Read DetailsNico Tinbergen conducted an experiment with three-spined sti…
Nico Tinbergen conducted an experiment with three-spined stickleback fish in which he discovered that during the breeding season, male stickleback fish would respond very agressively to any red model introduced nearby or inside the tank–even red models not shaped like fish at all, incuding red cars driving by the window! Tinbergen showed that it is the red color of an intruding male’s belly that provokes an agressive response in the breeding male, preventing the intruder from coming near the stickleback’s nest area. This type of response is called a
Read DetailsDiapause is the interruption of an organism’s life cycle in…
Diapause is the interruption of an organism’s life cycle in response to the environmental cues. The soil nematode Caenorhabditis elegans is capable of entering entering adult reproductive diapause (ARD) when food is scarce. In C. elegans, individuals normally become reproductively mature 2 days after hatching and remain fertile for 18 days. They reproduce either by self-fertilization or by mating with another individual. In an investigation, researchers examined the survival and reproductive success of female C. elegans who were without food for 0-30 days. Groups of C. elegans were held in ARD for different numbers of days before reintroduction of food. Average brood sizes (average number of offspring per adult) were determined following either self fertilization or mating with a well-fed males. The results are shown in Figure 1. There are tick marks on the horizontal axis labeled from left to right: 0, 3 through 15 in increments of 2, and 30, with a break indicated between 15 and 30. The vertical axis has evenly spaced tick marks labeled from 0 to 450 in increments of 50. There are two bars on each of the tick marks on the horizontal axis. In each pair, the unshaded bar represents self-fertilized and the shaded bar represents mated. Each bar also shows an error bar. From left toright, the data are as follows. All numbers are approximate. 0 days: self-fertilized, 260, error bar from 255 to 265; mated, 375, error bar from 325 to 420. 3 days: self-fertilized, 190, error bar from 185 to 200; mated, 245, error bar from 240 to 250. 5 days: self-fertilized, 120, error bar from 115 to 125; mated, 150, error bar from 140 to 170. 7 days: self-fertilized, 75, error bar from 70 to 80; mated, 125, error bar from 120 to 130. 9 days: self-fertilized, 50, error bar from 49 to 51; mated, 110, error bar from 95 to 115. 11 days: self-fertilized,40, error bar from 38 to 41; mated, 120, error bar from 110 to 130. 13 days: self-fertilized, 25, error bar from 24 to 26; mated, 100, error bar from 90 to 110.15 days: self-fertilized, 10, error bar from 9 to 11; mated, 125, error bar from 120 to 130. 30 days: self-fertilized, 5, error bar from 3 to 7; mated, 45, error bar from 35 to 50. The caption on the figure reads: Figure 1. Mean brood sizes plus or minus two times the standard error of the mean after different times in A R D. Individual C. elegans were held in A R D and subsequently allowed to reproduce either via self-fertilization (unshaded bars) or by mating with well-fed males (shaded bars). Figure 1. Mean brood sizes ± SEg after different times in ARD. Individual C. elegans were held in ARD and subsequently allowed to reproduce either via self-fertilization (unshaded bars) or by mating with well-fed males (shaded bars). In a second experiment, individuals were held in ARD without food for 0-30 days and monitored for average survival times following reintroduction of food (Figure 2). There are tick marks on the horizontal axis labeled from left to right: 0, 3 through 15 in increments of 2, and 30, with a break indicated between 15 and 30. The vertical axis has evenly spaced tick marks labeled 0 to 30 in increments of 5. Each bar shows an error bar. From left to right, the data are as follows. All numbers are approximate. 0 days: 18, error bar from 15 to 21. 3 days: 15, error bar from 12 to 18. 5 days: 18, error bar from 15 to 22. 7 days: 19, error bar from 17 to 23. 9 days: 19, error bar from 16 to 23. 11 days: 17, error bar from 14 to 20. 13 days: 16, error bar from 12 to 20. 15 days: 19, error bar from 16 to 23. 30 days: 22, error bar from 18 to 24. The caption on the figure reads: Figure 2. Mean survival plus or minus two times the standard error of the mean following different times in A R D. Individual C. elegans were held in A R D and subsequently given access to food, whereupon their survival times were determined. Figure 2. Mean survival ± SEg following different times in ARD. Individual C. elegans were held in ARD and subsequently given access to food, whereupon their survival times were determined. The average brood size per mated individual upon reintroduction of food following 30 days of ARD is closest to which of the following?
Read DetailsPopulation Census Level Population 4 4 3 360 2 780…
Population Census Level Population 4 4 3 360 2 780 1 5,782 In a simple ecosystem, a census of the population in four successive trophic levels was taken as shown above. If level 1 is composed of photosynthetic autotrophs, then the trophic level with 780 individuals will most likely represent ______.
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