Complexity (X) of a DNA fraction is the length
of
the longest nonrepeating sequence that could be produced by splicing
together
fragments in that fraction. What is the complexity of the
highly-repetitive
fraction in calf DNA? (You can estimate from Fig. 7.25b, C_{0}t_{½}
for the highly-repetitive fraction is ~ 4 x10^{-3}, and this
fraction
represents about 15% of the genome.)

2. Measuring repeat number for a genome
fraction

a) Given the following definitions

f_{i} ::= the fraction of the genome
represented
by component i
N ::= the size (bp) of the genome
X_{i} ::= the complexity (bp) of fraction i

derive an expression for R_{ i} where

R_{i} ::= the number of times fraction i is
repeated
in the genome (dimensionless)

b) If the calf genome (N) is 10^{ 9} bp,
how
many
times
is the repetitive fraction from a) repeated in the genome?

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