Chapter 6 - DNA Replication, Repair And Recombinaton
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Parent DNA turns into
2 daughter 6
DNA replication occurs
Before cell division
S phase
Synthesis phase
Hereditary
Passed faithfully from one generation to the next
Mutations
Changes in DNA
Mutation produce
Variations that underlie the difference between individuals of the same species or overtime they difference between one species and another
Crossing over aka
Homologous recombination
Crossing over
Exchange of genetic material (DNA) between homologous chromatids of homologous chromosomes during prophase 1
Crossing over occurs when
During prophase 1
Independent assortment of chromosomes
Random alignment of homologous chromosomes pairs tetrads on the metaphase plate during metaphase 1
Independent assortment happens when
Metaphase 1
What are three ways that makes humans different and diverse and not the same
Crossing over Independent assortment Random fertilization of gametes
What acts as a template for its own replication
DNA
A new strand is aka
Daughter strand
What are the three models for DNA replication
Semiconservative Dispersive Conservative
DNA replication is what kind of model
Semiconservative
Semiconservative model
Consist of 1 old and 1 new strand
Dispersive model
Each strand is a mixture of old and new DNA
Conservative model
2 old DNA strands together and 2 new DNA strands
Who confirmed that DNA is semiconservative
Confirmed by meselson and stahl
Replication origins are recognized by
Initiator proteins
What is true about eukaryotes and bacteria when it comes to replication forks
Eukaryotes have many replication origins, while bacteria have only 1 replication origin`
Replication forks
Y shaped junctions at which DNA synthesis occurs
Replication forks are unidirectional or bidirectional.
Bidirectional