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Chapter 21 The Genetic Control of Animal Development
Chapter 21 The Genetic Control of Animal Development

... During B cell development, the kappa light chain gene that will be expressed is assembled from one LV segment, one J segment, and the C segment by somatic recombination.  Segment joining is mediated by recombination signal sequences adjacent to each gene segment by a protein complex including ...
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Eukaryotic Genomes - Building Directory
Eukaryotic Genomes - Building Directory

... All cells in an organism contain an identical genome (set of genes) However, the genes expressed in the cells of each type are unique Most of the DNA in eukaryotic genomes are noncoding – unsure of its purpose  25,000 genes in humans  Only about 1.5% codes for protein The expression of specific ge ...
MBP 1022, LECTURE 3 DAN-ct30
MBP 1022, LECTURE 3 DAN-ct30

... One set of human chromosomes. Each somatic cell will have a maternal and paternal set, thus 44 chromosomes plus two sex chromosomes XX, female or XY, male = 46 TOTAL ...
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... 2. Spontaneous tautomerization and addition of base analogues both cause mutations in the DNA by a common mechanism. BRIEFLY explain how these events cause mutations to occur? Spontaneous tautomerization is a transient shift in a proton on a nitrogenous base from one atom to another. This shift alte ...
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Name - Schuette Science

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Bio 139 Exam Review Outline: Exam #3

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Chapter Outline - Ltcconline.net

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... Scientists that want to study a certain gene usually make multiple copies of that gene using bacterial plasmids, selfreplicating extra-chromosomal circular DNA molecules, that are distinctly different from the normal bacterial genome. Genes and other chromosomes are copied to make enough samples for ...
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... • This new sequence with the deleted base would be transcribed into mRNA. But then, the mRNA would be out of position by one base. • As a result, every codon after the deleted base would be different. • This mutation would cause nearly every amino acid in the protein after the deletion to be changed ...
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... What is the polymerase chain reaction? Our gene of interest is a minute part of the genome. If your gene is 2 kbp long, it would represent approximately 0.00001% of the human genome or 0.0002% of the fly genome. Even though your gene is present in isolated genomic DNA, it is difficult to study it or ...
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MODELING DNA REPLICATION

... Always keep the top facing up, and start with the 3’ end of the model toward your left hand. Reviewing DNA Structure Start with the long white pieces of DNA. 1. Find the 5’ and 3’ ends of the strands. The 5’ end has a terminal phosphate, and the 3’ end has a hydroxyl group on the end. 2. Note how th ...
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Cre-Lox recombination



In the field of genetics, Cre-Lox recombination is known as a site-specific recombinase technology, and is widely used to carry out deletions, insertions, translocations and inversions at specific sites in the DNA of cells. It allows the DNA modification to be targeted to a specific cell type or be triggered by a specific external stimulus. It is implemented both in eukaryotic and prokaryotic systems.The system consists of a single enzyme, Cre recombinase, that recombines a pair of short target sequences called the Lox sequences. This system can be implemented without inserting any extra supporting proteins or sequences. The Cre enzyme and the original Lox site called the LoxP sequence are derived from bacteriophage P1.Placing Lox sequences appropriately allows genes to be activated, repressed, or exchanged for other genes. At a DNA level many types of manipulations can be carried out. The activity of the Cre enzyme can be controlled so that it is expressed in a particular cell type or triggered by an external stimulus like a chemical signal or a heat shock. These targeted DNA changes are useful in cell lineage tracing and when mutants are lethal if expressed globally.The Cre-Lox system is very similar in action and in usage to the FLP-FRT recombination system.
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