Speciation is usually a relatively rapid process with easily defined boundaries

Speciation is usually a relatively rapid process with

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33. Speciation is usually a relatively rapid process with easily defined boundaries between different species. a.True b.False
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34. Which of the following represents a post-zygotic barrier to gene flow between two populations? 35. Which of the following is nota trend observed during the evolution of the homonin lineage? 36. There are two competing hypotheses regarding the phylogeography of the human species: the multiregional hypothesis and the out of Africa hypothesis. What piece of evidence supports the out of Africa hypothesis? 37. What piece of evidence supports the hypothesis that there was some small amount of gene flow between ancient Homo sapiens and other homonins that lived near them? a.Early fossil evidence of the homonin lineage are found exclusively in Africa b.Presence of members of the genus Homo other than Homo sapiens throughout Europe and Asia beginning about 2 million years ago c.Humans with African heritage have more mitochondrial genetic diversity than humans from all other geographical areas d.Humans with ancestors from Europe and parts of the middle east more often share mitochondrial haplotypes with Neanderthals
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BIOL 3301 Exam #3 Short Answers. Each question is worth 3 points. Use the back if you need more space. 1. What is a plasmid and what role have they played in the evolution of the bacterial genome? A circular piece of DNA that can act as an extra chromosome. These have dramatically impacted the evolution of prokaryotes because they are the main vehicle for lateral (horizontal) gene transfer which allows for movement of genes from one organism to another. 2. What is meant by the K a /K s ratio and what do the values of this ratio say about the type of evolution that has occurred between two sequences of homologous DNA? This is a measure of the proportion of non-synonymous ( K a ) to synonymous ( K s ) mutations between two homologous sequences of DNA. K a /K s > 1 : Positive Selection K a /K s 1 : Neutral Selection K a /K s < 1 : Purifying Selection 3. For each of the following list the estimated date of origin and the data used to arrive at that date.
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