640Lecture0305

640Lecture0305 - VARIATION morphological variation...

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VARIATION morphological variation – variability in morphological characters in Drosophila rare variants - BODY FORM WING TYPE EYE COLOR estimated average frequency of variant allele = 0.0028 Bithorax Different mutant alleles of the Bar locus : X-linked in Drosophila CONCLUSION visible variants are clearly rare types – (are they rare because they have a deleterious effect on carriers ????) variation in humans Morphological variation in humans – Very little “normal” morphological variation shows Mendelian inheritance Quantitative variation – Height – Birth weight Stabilizing selection concept for birth weight – blood pressure –IQ But, continuous characters can change in response to environment Environmental change: – Altered social conditions (socioeconomic status) – Improvement of nutrition – educational environment
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1 Variation in height in American Indian males ~ 1920 Changes in weight of 12-year old children in Sendai, Japan. (after Takahashi)
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1 Changes in height of 12-year old children in Sendai, Japan. (after Takahashi) Stature of English early teenage males ages
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2 Northern Europe (taller) Southern Europe (shorter) Change in stature for military recruits Are population differences in stature due to genetic differences or due to other environmental differences?
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This note was uploaded on 07/17/2008 for the course EEOB 640 taught by Professor Fuerst during the Spring '05 term at Ohio State.

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640Lecture0305 - VARIATION morphological variation...

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