>Robert L. Dorit, Hiroshi Akashi and Walter Gilbert, "Absence of Polymorphism
at the ZFY Locus on the Human Y Chromosome", Science, vol 268 (1995) pp
1183-1185<<
Yes that is the same study that Dr. Ross cited.
Robert asked,
>>Note also the conclusion of this secular (?) author. Homo sapiens did not
"coevolve" from many different homo erectus populations. How much of the
fossil evidence for human evolution does this effectively eliminate,
I wonder?<<
Robert,
This is a great example of not fully understanding what the writer is saying.
There are two theories of how modern man evolved from H. erectus. The first
is sometimes referred to as the 'Noah's ark' theory. In this scenario, most
of the evolution of successive species of hominid occurred in Africa with the
daughter populations spreading out from there to other parts of the world.
The second theory is sometimes called the "candelabra'" or multiregional
model. In this view, each local population evolved into the local population
of H. sapiens. Thus the H.erectus ancestors of Europeans would be different
from the H.erectus ancestors for the Chinese.
The work these guys did hurts the multiregional model but does not hurt the
competing model. Dorit et al write:
"We note that the results presented here are not compatible with most
multiregional models for the origin of modern humans. While the geographic
location of the ancestral Y lineage cannot be determined from these data, the
age of that lineage does lend support to the hypothesis of a recent, single
orgin of modern Homo sapiens, and one of our estimates (270,000 years) is
congruent with the estimated age of the ancestral mitochrondrial DNA
lineage."Robert L. Dorit, Hiroshi Akashi and Walter Gilbert, "Absence of
Polymorphism at the ZFY Locus on the Human Y Chromosome", Science, vol 268
(1995) pp 1184
I was somewhat puzzled by that study and the citation of it by Hugh Ross.
There is much evidence that there are more differences in the Y-chromosome
than would be possible with the YEC/recent global flood model. I have the
following from my files.
"Familial segregation studies have shown that variations of these five
fragments are inherited in a medelian fashion, and are strictly Y-linked. A
survey of numerous male individuals indicated tha the five variable Taq I
fragments detected by probes 49f and 49a can be considered as five
independent alleleic series, each series representing the different and
mutally exclusive alleleic forms observed for a single DNA fragment."~G.
Lucotte, "Evidence for the Paternal Ancestry of Modern Humans: Evidence from
a Y-Chromosome Specific Sequence Polymorphic DNA Probe," in Paul Mellars and
Chris Stringer, The Human Revolution, (Princeton: Princeton University Press,
1989), p. 39.
16 different types of Y-Chromosome among 44 Caucasian unrelated individuals
Locus
Haplotypes A C D F I Frequency
I Ao Co Do F1 I1 2.3
II Ao Co D1 F1 I1 2.3
III A1 Co D1 F1 Io 2.3
IV A1 Co Do F1 I1 2.3
V A2 Co Do F1 I1 4.6
VI A2 Co D1 Fo I1 2.3
VII A2 Co D1 F1 Io 6.8
VIII A2 Co D1 F1 I1 2.3
IX A2 C1 Do F1 I1 2.3
X A3 Co Do F1 Io 4.6
XI A3 Co Do F1 I1 4.6
XII A3 Co D1 F1 Io 18.2
XIII A3 Co D1 F1 I1 6.8
XIV A3 C1 D1 F1 I1 11.4
XV A3 C1 D2 F1 I1 22.7
XVI A4 Co D1 F1 Io 4.6
XVII A2 Co Db F1 I1
"This probe represents the most powerful tool so far developed for the
analysis of patriarchal relationships in human populations. Because of the
numerous mutation events the probe can detect, it is also of special interest
in studying polymorphisms in small ethnic groups. Taq I polymorphism,
revealed with probe 49f, was studied in Papuans of the Baruya tribe, living
in the Wonenara valley. All the individuals screened are adentical at the
variable loci A, C, F and I, and fixed for the specific allele Db. The
deduced haplotype, number XVII (A2,Co, Db, F1, I1), is Baruya-specific."~G.
Lucotte, "Evidence for the Paternal Ancestry of Modern Humans: Evidence from
a Y-Chromosome Specific Sequence Polymorphic DNA Probe," in Paul Mellars and
Chris Stringer, The Human Revolution, (Princeton: Princeton University Press,
1989), p. 41
There is much evidence for a lot of variability in the Y-chromosome. The fact
that Doritt et al selected a non variable area or got unlucky in the 38 men
they picked does not mean that evolution is wrong.
glenn