Selection
Overzicht
Why do bacteria stop responding to antibiotics? Why do farm animals and crops look so different from their wild ancestors? The answer to both is selection: in nature the environment does the choosing, while in farming humans do. The same basic mechanism, some individuals leaving more offspring than others, drives both.
In this lesson you will describe natural selection step by step, describe and apply selective breeding to crops and livestock, and (for Extended) define adaptation, explain antibiotic resistance as natural selection in action, and contrast natural with artificial selection.
Doelstellingen
- Describe natural selection with reference to: (a) genetic variation within populations (b) production of many offspring (c) s truggle for survival, including competition for resources (d) a greater chance of reproduction by individuals that are better adapted to the environment than others (e) these individuals pass on their alleles to the next generation
- Describe selective breeding with reference to: (a) selection by humans of individuals with desirable features (b) crossing these individuals to produce the next generation (c) selection of offspring showing the desirable features
- Outline how selective breeding by artificial selection is carried out over many generations to improve crop plants and domesticated animals and apply this to given contexts
- [Supplement] Describe adaptation as the process, resulting from natural selection, by which populations become more suited to their environment over many generations
- [Supplement] Describe the development of strains of antibiotic resistant bacteria as an example of natural selection
- [Supplement] Outline the differences between natural and artificial selection
Lesnotitie
Beschikbaar in de Green Bridge-app
Download de Green Bridge CBT-app op je telefoon of computer voor toegang tot volledige lesnotities, oefenvragen en meer.
Lesevaluatie
Gefeliciteerd met het voltooien van de les op Selection. Nu je de sleutelconcepten en ideeën, het is tijd om uw kennis op de proef te stellen. Deze sectie biedt een verscheidenheid aan oefeningen vragen die bedoeld zijn om uw begrip te vergroten en u te helpen uw begrip van de stof te peilen.
Je zult een mix van vraagtypen tegenkomen, waaronder meerkeuzevragen, korte antwoordvragen en essayvragen. Elke vraag is zorgvuldig samengesteld om verschillende aspecten van je kennis en kritisch denkvermogen te beoordelen.
Gebruik dit evaluatiegedeelte als een kans om je begrip van het onderwerp te versterken en om gebieden te identificeren waar je mogelijk extra studie nodig hebt. Laat je niet ontmoedigen door eventuele uitdagingen die je tegenkomt; beschouw ze in plaats daarvan als kansen voor groei en verbetering.
- In natural selection, the individuals most likely to pass on their alleles are those that are: A. the largest B. best adapted to their environment C. born first D. selected by humans Answer: B
- Selective breeding is best described as selection carried out by: A. the environment B. humans C. predators D. chance alone Answer: B
- Antibiotic resistance in bacteria first arises by: A. the antibiotic teaching the bacteria B. a chance mutation C. bacteria choosing to resist D. selective breeding Answer: B
- Which is a disadvantage of selective breeding over many generations? A. it increases variation B. it reduces genetic variation C. it is very fast D. it removes humans from the process Answer: B
- A key difference between natural and artificial selection is that artificial selection is carried out by: A. the environment B. humans C. mutation D. predators Answer: B
Beschikbaar in de Green Bridge-app
Download de Green Bridge CBT-app op je telefoon of computer voor toegang tot volledige lesnotities, oefenvragen en meer.
Beschikbaar in de Green Bridge-app
Download de Green Bridge CBT-app op je telefoon of computer voor toegang tot volledige lesnotities, oefenvragen en meer.
Aanbevolen Boeken
Oefen Proefexamenvragen
Wilt u proefexamenvragen over Selection oefenen? Download de Green Bridge CBT-app voor toegang tot proefexamenvragen en volledige oefentoetsen over dit onderwerp.
Download de app in de Google Playstore
Alles wat je nodig hebt om uit te blinken in JAMB, WAEC en NECO.
