Exam 24: Evolutionary Genetics

In the study of polytene chromosomes among Drosophila it was determined that __________ selection plays an important role in maintaining chromosomal polymorphisms in nature.

Which publication by Charles Darwin outlines his theory for evolution?

Which of the following were not explained in Darwin's theory of evolution? 1)The origin of variation among individuals 2)How particular variants are inherited 3)How individuals are selected in nature to pass on their traits

Which of the following is a key event in the speciation process? 1)Artificial selection 2)Genetic drift 3)Development of reproductive isolation between populations

Which of the following is considered a "document of evolutionary history" today?

What did Darwin propose to be the driving force of evolution in nature?

A researcher has sequenced a gene from four populations of an organism,denoted 1,2,3,and 4.This gene consists of two exons separated by an intron; a 5¢ untranslated region (UTR)is included in the first exon,and a 3¢ UTR is included in the second exon.When we align the four sequences of this gene,we find that two of them have a transposable element insertion in the 3¢ UTR,and three of them have lost a short sequence within the intron.We also see that each of the four sequences has at least one feature that uniquely distinguishes it from all the other sequences-a G:C base pair near the start of the coding sequence in exon I in sequence 1,an A:T base pair near the start of exon II in sequence 2,a C:G base pair in the 5¢ UTR and a T:A base pair near the end of the coding sequence in exon II in sequence 3,and an A:T base pair in the 5¢ UTR,a C:G base pair in the middle of exon II,and a G:C base pair in the 3¢ UTR in sequence 4.Based on these similarities and differences,draw a phylogenetic tree to show how the four sequences are related.

How are silent polymorphisms possible? 1)The degeneracy of the genetic code 2)The commaless nature of the genetic code 3)The high rate of mutations in species

Which of the following can be shown using a phylogenetic tree? 1)Relationships among organisms 2)How each organism in the tree evolved over time 3)Chromosomal makeup of each organism

According to Darwin's theory of natural selection: 1)Individuals within a species vary with regards to heritable traits. 2)Individuals who have certain characteristics are more able to survive and reproduce. 3)Individuals who pass their traits down to offspring will eventually change the characteristics of the species.

Different forms of an enzyme encoded by different alleles of a gene are known as

The process of evolving reproductive isolation between subpopulations that exist in the same territory is called

Which type of variation was first to be analyzed by naturalists and geneticists?

A distinct basic structure in a phylogenetic tree is known as

In The Origin of Species,Darwin repeatedly referred to evolution as a process of

Briefly explain the various forms of DNA technologies and how they are used to study genetic variability in various species.

Which type of DNA sequence exhibits the highest evolutionary rates?

Fossil evidence indicates that the remote ancestors of human beings evolved in Africa,beginning about

Genetic evidence indicates that modern human populations may have emerged from Africa and subsequently spread to other continents how many years ago?

Who is credited with proposing the original theory of evolution?