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18 Cards in this Set
- Front
- Back
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phenotypes are a result of |
mixing genes from two parents via sexual reproduction |
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Gene pool |
sum of all genes in a population |
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populations with larger gene pools are said to have a larger?? |
genetic fitness |
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Inheritable variation excludes the effectsof ‘local factors’ which are |
light, food and water availability |
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allele |
one of a pair of genes that appear at a particular location on a particular chromosome and control the same characteristic |
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A stable environment will favour populations with littleinherent ____________ |
variability |
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Gene Flow |
the transfer of alleles or genes from one population to another. Migration into or out of a population may be responsible for a marked change in allele frequencies |
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Mutations |
Random changes in genetic material |
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Non-random Natural Selection |
environment selects for those inheritedmutations which are advantageous and selects against those which aredeleterious |
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bottleneck |
extreme reduction of alleles and genetic fitness |
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convergence |
features of dissimilar origin which look alike |
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analogy |
characters which look the same but have different origins |
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dimorphism |
‘two dissimilar types’ (sexual dimorphism: males & females) |
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homology |
different characters having the same structural origin |
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immutable |
unchanged throughout the passage of time |
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mineralisation |
replacement of tissue with inert mineral to form a fossil |
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primitive (trait) |
trait or character which occurred in an ancestor. |
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systematics |
study of diversity and relationships between organisms (also taxonomy) |
