bio

Q: Why is the species concept important, especially for conservation efforts? A: It helps classify species, identify similarities and differences, and regulate interactions for conservation. Q: What is the morphospecies concept? A: It classifies species based on morphological traits. Advantages: Easy to visually identify. Disadvantages: Mimicry and ambiguous interpretations among scientists. Q: What is the biological species concept? A: It defines species by the ability to interbreed and produce viable offspring. Advantages: Straightforward definition. Disadvantages: Excludes asexual and extinct species, and hybrids complicate classification. Q: What is the phylogenetic species concept? A: Identifies species based on evolutionary history and unique traits. Advantages: Applicable to any population. Disadvantages: Limited to populations with evolutionary data. Q: How do dispersal and vicariance result in allopatric speciation? A: Dispersal: Population moves and adapts to a new habitat. Vicariance: Physical barriers split habitats, isolating populations. Q: How does disruptive selection lead to sympatric speciation? A: It favors extremes in a population, creating bimodal distributions and driving divergence within the same environment. Q: What are the four major species interactions and their nomenclature? A: Commensalism (+/0): One benefits, the other is unaffected. Competition (-/-): Both species suffer from resource limitation. Consumption (+/-): One benefits at the expense of another. Mutualism (+/+): Both species benefit. Q: Define ecological niche. A: The range of resources a species uses and conditions it tolerates. Q: What is the difference between fundamental and realized niches? A: Fundamental: Full range of resources. Realized: Limited range due to competition. Q: What is competitive exclusion? A: When two species compete for the same niche, the more competitive species outcompetes the other. Q: What are the parts of a phylogenetic tree? A: Root: Common ancestor. Node: Splitting point of lineages. Branch: Connections between nodes. Tip: Present-day species. Q: Define apomorphy, plesiomorphy, and synapomorphy. A: Plesiomorphy: Ancestral trait. Apomorphy: Derived trait. Synapomorphy: Shared trait in a lineage. Q: What is the Cambrian explosion? A: A period of rapid species diversification due to oxygen increase, predation, niche differentiation, and Hox gene evolution. Q: How does natural selection affect human skin color? A: High UV areas favor more melanin to prevent skin cancer, passing protective traits to offspring. Q: What is adaptive radiation? A: Rapid evolution of species to fill various niches, leading to ecological and morphological diversity. Q: What is the sixth mass extinction caused by? A: Habitat loss, climate change, overfishing, pollution, and global trade. Q: What is parsimony in phylogenetics? A: The simplest explanation, with the least evolutionary changes, is most likely correct.