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2Inheritance pt 2

2Inheritance pt 2 - 4 Steps for PCR 1 Collect DNA sample...

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Sheet1 Page 1 Linkage Linkage: because some genes are so close together on a chromosome they are generally transferred as a unit Crossing: exchange of chromosome parts during synopsis in Meiosis 1 -results in recombinant chromosomes -allows for greater variation -less possibility of genes close together to be recombined than those further apart -allow for genetic mapping Homeotic Genes (Homeobox -arranged in anterior to posterior body sequence or proximal to distal for limbs -variations for when turned on and for how long to produce dramatically different body plans Analyzing DNA: -Tandem repeats: short DNA sequences repeated many times (TTTTTC repeated 4 times) 97% of your DNA is junk (or at least we think it is worthless) -vary in types and numbers for each person -1 in a trillion chance DNA is same in 2 people -helps solve crimes and check percentage We do not need a large DNA sample to analyze because of amplification. --Amplification is the process of making many copies for analyzation --Process is done via PCR (polymerase chain reaction) it is very fast
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Unformatted text preview: 4 Steps for PCR 1.) Collect DNA sample: cells, saliva, hair, blood, semen 2.) Isolate: separate DNA from other cell components to make it pure 3.) PCR: cut DNA into segments, then make copies (from 1 strand to 1 billion) 4.) Gel electrophoresis to determine pattern Epigenome-markers + switches along DNA that turn the expression of genes on and off-sensitive to cues from environment-a toxin or diet can affect the epigenome-this influence can be passed onto future generations (up to 4)-possible factors for cancer, depression, schizophrenia, dementia, Alzheimer, autism DNA Fingerprinting h unique array of DNA sequences for each person--smaller tandem repeats migrate faster & farther through viscous gel than longer ones h staining to highlight pattern -thus diet, drugs, or motherhs care (via release of serotonin) can influence offspring Sheet1 Page 2 HOX): linked gene complexes that develop a body plan...
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