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Description
Flashcards by lilli.atkin, updated more than 1 year ago
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Created by lilli.atkin
almost 9 years ago
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| Question | Answer |
| What are differences between individuals of the same species caused by? | Different alleles |
| Sum up natural selection | -More organisms created than can possibly survive -Competition for resources such as food -variation in all species -Therefore the best adapted will survive and pass on more of their characteristics to their off spring |
| Name two advantages of having a large gene pool | -greater chance of some individuals having a favorable genotype so they can survive unfavorable conditions -faulty alleles are unlikely to be paired up and expressed |
| What is a genetic bottleneck? | Large population becomes small, due to natural disaster, some individuals remain and some genotypes are lost. population recovers from a small number |
| what is the founder effect? | is the loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population |
| List the advantages and disadvantages of selective breeding | Advantages - produces high yielding crops and animals which results in more affordable food -more tolerant strains that can live where other strains cant -produces more disease resistant individuals. Disadvantages - reduces genetic variation due to inbreeding, lead to health problems. -inbreeding increase the number of individuals with genetic disease |
| An organ is.... | a collection of specially organised tissues tat performs a function |
| What do antibiotics fight? | Bacterial disease |
| Define evolution | the gradual change in the characteristics of a species so that they become more adapted to their environment |
| Give a few examples of antibiotic action | - inhibit an enzyme that bacteria use to build their cell walls -preventing protein synthesis by inhibiting ribosomes -interfering with DNA replication |
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