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Crossing Over NOTES
Crossing Over
DNA: genetic material packaged in
chromosomes
Gene: a segment of DNA found on a
chromosome
Chromosome Number
diploid
Normal body cells: 2n
have a full set of paired chromosomes
haploid
Gametes: n
have a full set of single chromosomes
allele -is the form of a gene
(example: blue eyes or brown eyes)
Homologous- pair of identical
chromosomes
tetrad- four chromatids in a pair of
homologous chromosomes
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Crossing Over NOTES
Crossing Over
When does it happen: prophase 1 of meiosis
What happens: in a homologous pair DNA from
similar sections of the chromosome change
places
Results in Genetic Variation in offspring
The law of independent assortment states that
genes separate independently of one another
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