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Humans have a total of 23 pairs of chromosomes. Each pair contains one chromosome from
mom and one from dad. The RFLP markers most commonly used for DNA profile analysis are
found on chromosomes 1, 2, 4, 5, 10 and 17. These RFLP markers are named after their locations
on these chromosomes. For example, the marker on chromosome 2 is called D2S44 (section 44
of chromosome 2). These chromosomal locations are also referred to as DNA loci (from Latin:
locus is singular, loci are plural).
Autorads are x-ray films with dark bands representing RFLP markers. The bands are found in
lanes, and each lane in this autorad contains DNA fragments from a different source. As you may
recall, bands containing longer fragments of DNA are toward the top of the autorad and bands
containing shorter fragments are toward the bottom. This is where the "Length Polymorphism"
of RFLP is important; Because different individuals will have many different lengths of DNA
possible at the location of an RFLP marker, and different people will have bands at different
places. Children inherit one copy of an RFLP marker from their mother and one copy from their
father.
Below is an autorad from a single RFLP locus probe DNA fingerprint analysis for a man and
woman and their four children. Examine the image and determine which children, if any, are not
the genetic offspring of the couple.
Fig 2

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Humans have a total of 23 pairs of chromosomes. Each pair contains o.pdf

  • 1. Humans have a total of 23 pairs of chromosomes. Each pair contains one chromosome from mom and one from dad. The RFLP markers most commonly used for DNA profile analysis are found on chromosomes 1, 2, 4, 5, 10 and 17. These RFLP markers are named after their locations on these chromosomes. For example, the marker on chromosome 2 is called D2S44 (section 44 of chromosome 2). These chromosomal locations are also referred to as DNA loci (from Latin: locus is singular, loci are plural). Autorads are x-ray films with dark bands representing RFLP markers. The bands are found in lanes, and each lane in this autorad contains DNA fragments from a different source. As you may recall, bands containing longer fragments of DNA are toward the top of the autorad and bands containing shorter fragments are toward the bottom. This is where the "Length Polymorphism" of RFLP is important; Because different individuals will have many different lengths of DNA possible at the location of an RFLP marker, and different people will have bands at different places. Children inherit one copy of an RFLP marker from their mother and one copy from their father. Below is an autorad from a single RFLP locus probe DNA fingerprint analysis for a man and woman and their four children. Examine the image and determine which children, if any, are not the genetic offspring of the couple. Fig 2