...
Post A Reply
my profile
|
directory
login
|
register
|
search
|
faq
|
forum home
»
EgyptSearch Forums
»
Egyptology
»
Was E1b1b Brought Back Into Africa via Arab Invasion?
» Post A Reply
Post A Reply
Login Name:
Password:
Message Icon:
Message:
HTML is not enabled.
UBB Code™ is enabled.
[QUOTE]Originally posted by the lioness,: [QB] https://research-information.bris.ac.uk/ws/portalfiles/portal/34485399/234806.pdf [b]METRIC VERSUS NON-METRIC SKELETAL TRAITS: WHICH IS THE MORE RELIABLE INDICATOR OF GENETIC DISTANCE ? With special reference to crania from ancient Greece and Egypt.[/b] Judith Elaine Powell Department of Anatomy Bristol Medical School. A thesis submitted to the University of Bristol in accordance with the requirements for the degree of Doctor of Philosophy in the Faculty of Science. March 1989 1.1.3. Morphological variation in the cranium. For over a century now, morphological variation in the cranium has been the focus of studies of population affinity. It is generally accepted that skulls, jaws and teeth are the structures . in which the effects of natural selection and the n-dcroevolutionary chang6s which follow can be most readily detected (Musgrave and Evans 1980). There is disagreement among craniologists, however, about which morphological features are the most reliable indicators of genetic distance. Some regard metric traits (cranial measurements reflecting size and shape of the skull) as the most rewarding sphere of study; others claim that n-dnor morphological variants such as sutural bones, number and site of -2- INTRODUCION foramina and bony bridges (collectively known as epigenetic, non-metric or quasi-continuous traits) are generally superior indicators of population affinity. The object of this work is to compare distance measures derived from both metric and non-metric traits, with a view to determining which type is the more useful for answering questions about population affinity. _______________ Despite the superior performance of metric traits in this work, it should not be taken as advocating the abandonment of non-metric studies. In certain circumstances (e. g. where there is much distortion, or irreparable fragmentation of the crania) discrete traits may be all that is available. They are undoubtedly much quicker to record than measurements, even if accurate scoring is more difficult to attain than was at first thought. They do contain some genetic information, as several studies have shown, though further elucidations of their modes of development is needed before they can live up to their initial promise. Furthermore, several workers (Brothwell 1981, Corruccini 1974, Ossenberg 1976, Kaul et al. 1979) are of the opinion that they are only of use for studying relationships within major racial stocks. If this were the case, it would explain why many otherwise successful non-metric studies turn up the odd aberrant result. However, it is hoped that the present work will stimulate a renewed interest in craniometric analysis. 6.4. The implications of this work for metric studies. Apart from its major findings, this study has several implications for the practical exercise of metric analysis. Most importantly, it emphasises the value of metric studies when sample sizes are small. The superior performance of metric distances, as presented in this Crania from Egypt and Greece should again be measured by a single person, using a single school of measurements, to confirm that the differences between Greek and Egyptian crania apparent in this work are not only due to different workers using different methods [/QB][/QUOTE]
Instant Graemlins
Instant UBB Code™
What is UBB Code™?
Options
Disable Graemlins in this post.
*** Click here to review this topic. ***
Contact Us
|
EgyptSearch!
(c) 2015 EgyptSearch.com
Powered by UBB.classic™ 6.7.3