Flashcards
Unit 4.1 Diversity of life
Flashcards do conjunto (20)
- 1Q: Define SpeciesA: a species is the smallest unit of biological classification & a group of similar individuals that interbreed to produce fertile offspring under natural condition.
- 2Q: Define hybrids, hybridise & hybridisationA: hybrids is an offspring of different species. hybridise is when 2 different species interbreed & hybridisation is the process of creating hybrids.
- 3Q: Why is it that individuals of different species cannot interbreed to produce fertile offspring?A: This is because of genetic incompatibility. species are genetically incompatible because of important differences in their DNA or chromosome structure & number.
- 4Q: What are problems hybrids usually have?A: They often have health problems or are infertile.
- 5Q: Define hybrid vigourA: the tendency of a cross-bred individual to show qualities superior to those of both parents.
- 6Q: Give an example of hybridisation.A: a cross between a male lion and a female tiger to produce a 'liger' & a horse between a donkey but their offspring are usually infertile.
- 7Q: Define taxonomy.A: the science of classifying organisims such as biological.
- 8Q: Why is understanding & grouping organisms important?A: it is important for agriculture, medicine & even survival.
- 9Q: What were the 2 basic groups Aristotle classified, What did he recognize and what were the terms he first used?A: The 2 basic groups are plants & animals. He recognized that some animals have a back bone & others didn't. He was the first to use the terms invertebrate and vertebrate.
- 10Q: What is the difference between vertebrate and invertebrate?A: animals with a backbone are called vertebrates and animals without a backbone are called invertebrates.
- 11Q: Define Linnaean classificationA: a hierarchical system of classifying organisms, aimed at reflecting their evolutionary relationships.
- 12Q: Define morphologyA: the physical form or structure of an organism.
- 13Q: Define evolution & who was the first scientist to use the word?A: Evolution is the change in the characteristics of a species over many generations. The first scientist to use it was Charles Lyell.
- 14Q: The geological time scale had been developed and divided into 3 pairs, name them.A: Paleozoic, Mesozoic & Cenozoic.
- 15Q: Define generation.A: The time between the birth of an individual & when that individual produces their own offspring.
- 16Q: What does it mean when species become more or less complex?A: whether a species become more or less complex, It depends on the characteristics the species need in order to survive in its environment.
- 17Q: Who was Charles Darwin and what led him to believe that species could change?A: He was an English biologist and while writing his book 'The voyage of the beagle' he began to wonder whether a species could change and collected specimens as he wrote.
- 18Q: Who was Alfred Russel Wallace & how did he find out the contribution to the understanding of evolution & biogeoraphy.A: He was an English biologist. He collected & studied over 126000 specimens, several thousand were new to science.
- 19Q: Define artificial selection.A: The process by which we choose to breed particular organisms with desirable features. artificial selection only happens over generations.
- 20Q: What is cross-breeding & inbreeding?A: cross- breeding is selective by combining in the offspring a desirable feature of one individual with a different desirable in another individual. Inbreeding is selective breeding between 2 closely related individuals.
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- FlashCards sobre Unit 4.1 Diversity of life, criado por hadil musawi em 12-03-2018.
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- hadil musawi
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