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Description
Flashcards by Fatima Hilal, updated more than 1 year ago
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Created by Fatima Hilal
over 6 years ago
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| Question | Answer |
| [4.2] Q1: what does natural selection help humans explain? | natural selection helps us explain how species change and become adapted to their environments and how new species evolve. |
| [4.2] Q2: what is natural selection? | natural selection is the process by which an environmental factor acts on a population and results in some organisms having a greater chance of survival and producing an offspring . |
| [4.2] Q3: what is the meaning of a selective agent ? | The environmental factor that acts on the population |
| [4.2] Q4: what is the definition of selection pressure ? | The definition of selection pressure is the effect of the selective agent on the population. |
| [4.2] Q5: what is the difference between abiotic and biotic factors ? | biotic factors are living things such as plants and animals abiotic is non living things such as water and air. |
| [4.1] Q6: define sexual selection? | it is a special case of natural selection in which the environment factor is the selection of a mate. |
| [4.1] Q7: what was the peppered moth ? | it was a study studied by kettlewell and existed in two forms the normal colour was white with black specks. |
| [4.1] Q8: what are pesticides used for ? | it is a chemical sprayed on crops to stop insects from eating the food the pesticide kills them |
| [4.1] Q9: what is the meaning of resistance ? | it is the inherited ability of a species to withstand harmful chemicals. |
| [4.1] Q10: define the word antibiotics ? | chemicals by organisms such as fungi to defend themselves against bacteria. |
| [4.1] Q11: what does biodiversity mean? | the number and range of different species that are existing. |
| [4.1] Q12: how did Alexander Fleming find a way to kill bacteria ? | he discovered that some fungi create special chemicals to defend themselves against bacteria. |
| [4.1] Q13: name a dangerous type of bacteria ? | golden staph is resistant to many antibiotics and very difficult to kill. |
| [4.1] Q14: define biodiversity ? | the number and variety of different species that exist in the world . |
| [4.1] Q14: what does speciation mean ? | the process by which one or more species splits into 2 or more species. |
| [4.1] Q15: what are the three steps to the process of speciation? | variation isolation and selection |
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