Re: Natural selection and favorable traits how were they measured ?
- From: hersheyh <hersheyhv@xxxxxxxxx>
- Date: Tue, 12 Feb 2008 06:59:52 -0800 (PST)
On Feb 12, 3:01 am, backspace <sawireless2...@xxxxxxxxx> wrote:
On Feb 11, 11:46 pm, wf3h <w...@xxxxxxxxxxxxxxx> wrote:
[snip]
But the
reason is that allele, phenotype, genotype are used when telling us an
evolutionary fairytale because the words have a nice ring to it
because it would be poetically ackward to use the word gene the whole
time
The words 'allele', 'phenotype', and 'genotype' are used because they
do not have the same meaning as the word 'gene'. 'Alleles' are
specific *forms* or *sequences* of a 'genetic locus'. Any given
'gene' can have multiple 'allelic' forms. So, when *real* scientists
use the term 'gene' they are talking about all the allelic forms of a
particular genetic locus that, typically, but not always, encodes a
protein. [In much modern scientific literature you will see the term
"genetic locus" instead of the term "gene". They are almost the same
thing.]
"Phenotype" is an observable appearance or function in an organism.
Phenotypes do not necessarily or directly arise from 'genotypes' (a
specific set of alleles at specific genetic loci). 'Phenotype' and
'gene' are not the same thing at all. *But* NS works on phenotype.
The local environment does not distinguish between a legless
individual who is legless because of an accident, a birth defect, or a
genetic difference. If being legless is detrimental (remember that
'detrimental' is defined as the direction which lowers reproductive
success; you can make the case that early death and sterility should
be considered 'favorable' rather than 'detrimental', but I notice that
you haven't), all of these legless organisms will tend to be
eliminated from the gene pool. Even those whose leglessness is not
genetic. However, only in the case where there is a genetic or
genotypic influence producing the leglessness will this change be a
case of *evolutionary* change by NS -- that is, NS is the differential
removal of genes that tend to produce leglessness in this organism.
"Genotype" and "phenotype" can be (but need not be) related, but the
relationship can be quite complex and indirect with significant
environmental input. Neither term is identical to "gene".
in concocting elaborate tautologies about stuff being a 'success'
and 'surviving' because they 'survived' and therefore the frog is a
successful frog due to its phenotypical allele being more "successful"
reproductively ......
Since it is clear that you do not have the slightest level of
knowledge of what these terms mean and do not want to learn, I will
let you wallow in your pigsty of total ignorance. You seem happy
there.
.
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