USING RUBY LANGUAGE PLEASE PART 1 A DNA strand is represented by a string of the characters A, C,…



A DNA strand is represented by a string of the characters A, C, G, and T, each of which

represents a nucleotide. The hamming distance between two DNA strands of the same length is

equal to the number of positions in which they differ. Hamming distance is used in

bioinformatics as a measure of the similarity of two strings. Create a DNA class that gets

initialized with a string of nucleotide characters. An instance of DNA responds to the to_s,

length, hamming_distance, contains, positions, and frequencies messages. Where a and b are

DNA instances of the same length, the message send a.hamming_distance(b) returns the

Hamming distance between a and b. a.contains(b) returns true if b appears as a substring in a,

and returns false otherwise. a.positions(n) returns an array of the (zero-based) positions in which

the nucleotide n occurs in increasing order. Frequencies returns a hash that maps each of the four

nucleotides to the number of times it occurs in the DNA instance.

>> dna1 =‘ATTGCC’)


>> dna1.length

=> 6

>> puts dna1


>> dna1.contains(‘TGC’)


>> dna1.contains(‘AT’))


>> dna1.contains(‘GG’)


>> dna1.positions(‘T’)

[1, 2]

>> dna2 =‘GTTGAC’)


>> dna1.hamming_distance(dna2)

=> 2

>> dna1.hamming_distance(dna1)

=> 0

>> dna1.hamming_distance(‘AT’))

ArgumentError: dnas of different lengths

from ass2.rb:17:in `hamming_distance’

from (irb):8

from C:/Ruby22/bin/irb:11:in ‘

>> dna1.frequencies

{“A”=>1, “T”=>2, “G”=>1, “C”=>2}


A DNA strand is represented by a string of the characters A, C, G, and T, each of which

represents a nucleotide. Each nucleotide has its complement as indicated by this Ruby hash:


‘A’ => ‘T’, ‘T’ => ‘A’, ‘C’ => ‘G’, ‘G’ => ‘C’


The reverse-complement of a DNA string is a new string in which each nucleotide is replaced by

its complement and the string is reversed. Reverse-complements are important in bioinformatics

since a strand of DNA can be read in forward direction or, equivalently, its complementary

strand can be read in its forward direction, which is reverse of the original string’s direction. Add

the reverse_complement method to your DNA class. In response to reverse_complement, it

returns a new DNA instance representing its reverse-complement. Note also that a == b if and

only if DNA instances a and b represent the same DNA strand.

>> dna1


>> dna2 = dna1.reverse_complement


>> dna2.reverse_complement


>> dna1.reverse_complement.reverse_complement == dna1

=> true

omplement.reverse_complement == dna1 => true

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