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Selection and evolution 1 (Selection)
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list two things for natural selection to happen in a population.
variation, selective pressure, reproduction of organisms
Both natural and artificial selection result in changes to phenotype. Always true, sometimes true or never true?
Always true
Selectively bred animals are healthier than the others. True or false
False
an increased ability to survive and grow well, as a result of outbreeding and therefore increased heterozygosity is called ....
hybrid vigour
a loss of the ability to survive and grow well, due to breeding between close relatives is called ....
inbreeding pressure
What is the main purpose in selective breeding?
to prouduce individuals with desired traits
the complete range of DNA base sequences in all the organisms in a species or population
gene pool
What is the selective pressure in the industrial melanism example?
predator/birds
What is an environmental factor that affects the chance of survival of an organism called?
selection pressure
What is the ability of an organism to survive and reproduce called?
fitness
Genes have no effect on continuous variation. True or false?
False
Environment has no effect on discontinuous variation. True or false?
True
Which type of graph is used to show discontinuous variation data?
bar graph
Which type of graph is used to show continuous variation data?
line graphs/ histogram
List 4 causes of genetic variation.
independent assortment of chromosomes, crossing over, random fusion of gametes, mutations
What does the image show? A plant only, an animal only or a plant and an animal together
A plant only (a fly orchid)
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