scholarly journals A Conceptual Characterization of Online Videos Explaining Natural Selection

2017 ◽  
Vol 26 (7-9) ◽  
pp. 975-999 ◽  
Author(s):  
Gustav Bohlin ◽  
Andreas Göransson ◽  
Gunnar E. Höst ◽  
Lena A. E. Tibell
Keyword(s):  
Natural Selection ◽  
Online Videos

scholarly journals Identification and Characterization of Human Genes Targeted by Natural Selection

2008 ◽  
Vol 6 (4) ◽  
pp. 173-180
Author(s):  
Ha-Jung Ryu ◽  
Young-Joo Kim ◽  
Young-Kyu Park ◽  
Jae-Jung Kim ◽  
Mi-Young Park ◽  
...  
Keyword(s):  
Natural Selection ◽  
Human Genes ◽  
Identification And Characterization

Genetic Assimilation and the Paradox of Blind Variation

2017 ◽  
Author(s):  
Arnaud Pocheville ◽  
Étienne Danchin
Keyword(s):  
Genetic Variation ◽  
Natural Selection ◽  
Genetic Assimilation ◽  
Random Mutation ◽  
Empirical Claim ◽  
Hypothetical Mechanism

This chapter confronts the neo-Darwinian core tenet of blind variation, or random mutation, with classical and recent models of genetic assimilation. We first argue that all the mechanisms proposed so far rely on blind genetic variation fueling natural selection. Then, we examine a new hypothetical mechanism of genetic assimilation, relying on nonblind genetic variation. Yet, we show that such a model still relies on blind variation of some sort to explain adaptation. Last, we discuss the very meaning of the tenet of blind variation. We propose a formal characterization of the tenet and argue that it should not be understood solely as an empirical claim, but also as a core explanatory principle.

scholarly journals Characterization of genetic variation and natural selection at the arylamineN-acetyltransferase genes in global human populations

2011 ◽  
Vol 12 (11) ◽  
pp. 1545-1558 ◽  
Author(s):  
Holly M Mortensen ◽  
Alain Froment ◽  
Godfrey Lema ◽  
Jean-Marie Bodo ◽  
Muntaser Ibrahim ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Natural Selection ◽  
Human Populations

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

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