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Biology Life 102
Chapter 21 The Genetic Basis of Development
49
Biology
Undergraduate 1
12/10/2012

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Term
What is the study of whole sets of genes and their interactions?
Definition
Genomics.
Term
What is the application of computational methods to the storage and analysis of biological data?
Definition
Bioinformatics.
Term
What where the three stages of the Human Genome Project?
Definition
Genetic (or linkage) mapping, physical mapping, DNA sequencing.
Term
What maps the location of several thousand genetic markers on each chromosome?
Definition
Linkage map (genetic map).
Term
What is a gene or other identifiable DNA sequence?
Definition
Genetic marker
Term
What are used to determine the order and relative distances between genetic markers?
Definition
Recombination frequencies.
Term
What expresses the distance between genetic markers, usually as the number of base pairs along the DNA?
Definition
Physical map.
Term
What is constructed by cutting a DNA molecule into many short fragments and arranging them in order by identifying overlaps?
Definition
Physical map.
Term
What are used to determine the complete nucleotide sequence of each chromosome?
Definition
Sequencing machines.
Term
How many base pairs does a complete haploid set of human chromosomes contain?
Definition
3.2 billion base pairs.
Term
What approach to genome sequencing skips genetic and physical mapping and sequences random DNA fragments directly?
Definition
Whole-genome shotgun approach.
Term
What is the current sequencing method of choice?
Definition
Whole-genome shotgun approach.
Term
What does Genbank software allow online visitors to search for matches to?
Definition
A specific DNA sequence, a predicted protein sequence, and common stretches of amino acids in a protein.
Term
What is the systematic study of all proteins encoded by a genome?
Definition
Proteomics.
Term
What carry out most of the activities of the cell?
Definition
Proteins, NOT genes.
Term
How many base pairs do the genomes of most bacteria and archaea have?
Definition
1-6 million base pairs.
Term
Within each domain, there is no systematic relationship between what?
Definition
Genome size and phenotype.
Term
What have the lowest gene density, or number of genes in a given length of DNA?
Definition
Humans and other mammals.
Term
What have many introns within genes and noncoding DNA between genes?
Definition
Multicellular eukaryotes.
Term
What makes up the bulk of most eukaryotic genomes?
Definition
Noncoding DNA sequences.
Term
How much of the human genome does not code for proteins?
Definition
98.5%.
Term
How much of the human genome codes for introns and gene-related regulatory sequences?
Definition
24%.
Term
What are former genes that have accumulated mutations and are nonfunctional?
Definition
Pseudogenes.
Term
What is present in multiple copies in the genome?
Definition
Repetitive DNA.
Term
What move from one site to another in a cell's DNA? (They are present in both prokaryotes and eukaryotes.)
Definition
Transposable elements.
Term
What are the two types of eukaryotic transposable elements?
Definition
Transposons and retrotransposons.
Term
How do transposons move within a genome?
Definition
By means of a DNA intermediate.
Term
How do retrotransposons move within a genome?
Definition
By means of an RNA intermediate.
Term
What type of retrotransposon sequences have a low rate of transposition and may help regulate gene expression?
Definition
LINE-1 (L1)
Term
What contains many copies of tandemly repeated short sequences?
Definition
Simple sequence DNA.
Term
What is a series of repeating units of 2 to 5 nucleotieds?
Definition
Short tandem repeat (STR).
Term
Where is simple sequence DNA common?
Definition
Centromeres and telomeres. It probably plays structural roles in the chromosome.
Term
What are collections of identical or very similar genes?
Definition
Multigene familes.
Term
What is a classic example of multigene families of nonidentical genes?
Definition
Alpha-globins and beta-globins.
Term
What is the basis of change at the genomic level?
Definition
Mutation.
Term
What were the genes of the earliest forms of life likely for?
Definition
Survival and reproduction.
Term
What is the condition known as when accidents in meiosis lead to one or more extra sets of chromosomes?
Definition
Polyploidy.
Term
How many chromosomes do humans have?
Definition
23.
Term
What is an enzyme that helps protect animals against bacterial infection?
Definition
Lysozyme.
Term
What is it called when errors in meiotic recombination lead to some mixing and matching of exons, either iwithin a gene or between two nonallelic genes?
Definition
Exon shuffling.
Term
What may block protein production?
Definition
The insertion of transposable elements within a protein-coding sequence.
Term
What may create new sites for alternative splicing in an RNA transcript?
Definition
Transposable elements.
Term
What are genes that have changed very little over time referred to as?
Definition
Highly conserved genes.
Term
What inform us about relationships among species that diverged from each other a long time ago?
Definition
Highly conserved genes.
Term
What is variation within humans due to?
Definition
single nucleotide polymorphisms, inversions, deletions, and duplications.
Term
What is the study of the evolution of developmental processes in multicellular organisms?
Definition
Evolutionary developmental biology. (Evo-devo)
Term
What are homeotic genes in animals called?
Definition
Hox genes.
Term
What is an identical or very similar nucleotide sequence within homeotic genes and some other developmental genes that is widely conserved in animals?
Definition
Homeobox.
Term
What are the regulatory equivalent of Hox genes of animals that are found in plants?
Definition
Mads-box genes.
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