Historical Basis of Modern Understanding DNA was first isolated from white blood cells by Friedrich Miescher, who called it nuclein because it was isolated from nuclei. Frederick Griffith’s experiments with strains of Streptococcus pneumoniae provided the first hint that DNA may be…
LEARNING OBJECTIVES In this section, you will explore the following questions: Connection for AP® Courses DNA polymerase is an efficient enzyme but it can make mistakes while adding nucleotides during replication. It edits the DNA by proofreading every newly added base.…
LEARNING OBJECTIVES In this section, you will explore the following questions: Connection for AP® Courses Concepts and examples described in this section are not in scope for AP. However, the roles of telomeres and telomerase in aging and cancer are informative…
LEARNING OBJECTIVES In this section, you will explore the following questions: Connection for AP® Courses As was stated previously, DNA replication is more complex than simply unzipping the double helix and making new complementary strands. Replication in prokaryotes starts from a…
LEARNING OBJECTIVES In this section, you will explore the following questions: Connection for AP® Courses The Watson and Crick model suggested a way in which DNA could be replicated during cell division. Basically, the two strands unwind and separate where the…
LEARNING OBJECTIVES In this section, you will explore the following questions: Connection for AP® Courses The currently accepted model of the structure of DNA was proposed in 1953 by Watson and Crick, who made their model after seeing a photograph of…
LEARNING OBJECTIVES In this section, you will explore the following questions: Connection for AP® Courses Today the three letters “DNA” have become synonymous with crime solving, paternity testing, human identification, and genetic testing. All of these procedures are possible because of…
Figure 14.1 Michael Morton went to jail in 1986 for the murder of this wife. Twenty-five years later, in 2011, he was exonerated of her murder by DNA evidence. (credit: Lauren Gerson) Chapter Outline 14.1 Historical Basis of Modern Understanding 14.2 DNA Structure and…
Chromosomal Theory and Genetic Linkages The Chromosomal Theory of inheritance, proposed by Sutton and Boveri, states that chromosomes are the vehicles of genetic heredity. Neither Mendelian genetics nor gene linkage is perfectly accurate; instead, chromosome behavior involves segregation, independent assortment,…
LEARNING OBJECTIVES In this section, you will explore the following question: Connection for AP® Courses The number, size, shape, and banding patterns of chromosomes make them easily identifiable in a karyogram and allows for the assessment of many chromosomal abnormalities. Although…