BIO2008: Lecture 8

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  • Created by: LMoney
  • Created on: 11-05-14 13:04
Which is lower broad (H^2) or narrow (h^2) sense heritability?
narrow sense heritability
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which is more useful for predicting evolutionary change, broad or narrow sense heritability?
Narrow sense heritability
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what does similarity of related individuals measure?
Are offspring of one mother/family more similar to each other than they are to other random plants/animals?
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if character has high h^2 (narrow sense heritability), what does this mean?
character very similar within families, variation is largely found between families?
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if character has low h^2, what does this mean?
brothers and sisters not more similar to each other than to anyone else- variation is both within and between families
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how can we estimate heritability?
htN (narrow sense heritability) = VA / (VA + VE)- By doing an analysis of variance we can partition the variation due to genetics (family) and due to the environment
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What is best experiment to estimate heritability h^2 of flower size in an annual plant, without selecting?
Measure ‘brothers and sisters’ of multiple families
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Will the heritability for a particular character (e.g. wing length) be the same for animals from different populations of the same species and why?
No: Strong selection for a particular character lowers additive genetic variation over long term Results in low heritability in particular populations, namely in those where particular character is important (is selected)
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would this necessarily affect this character (e.g. wing length)?
No, not necessarily
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Is heritability a measure fixed for a certain character across all species?
No
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Is there a single heritability of a character in a species?
Not really
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Heritability of a character in a specific population?
Better
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Do morphological characters or reproductive and life history characters tend to have
Reproductive and life history characters
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Are P major and P intermedia two species with little gene flow or 1 species with lots of gene flow?
separate species with little local gene flow
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Expect that those from long grass habitats have spikes(blank) than those from mown grass?
longer and straight
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Card 2

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which is more useful for predicting evolutionary change, broad or narrow sense heritability?

Back

Narrow sense heritability

Card 3

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what does similarity of related individuals measure?

Back

Preview of the front of card 3

Card 4

Front

if character has high h^2 (narrow sense heritability), what does this mean?

Back

Preview of the front of card 4

Card 5

Front

if character has low h^2, what does this mean?

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Preview of the front of card 5
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