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DNA and all that Jazz

Theo and Smurf

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Across
1.an increase in ______ causes DNA strands to seperate
4.We compare amino acid ______ to see how closely two species are related
7.base pairs A,T and C,G are both _____ to each other
8.how many helix's on a strand of DNA?
10.when the nucleotide bases in DNA of a species change it is known as _____
11.what is a double helix of DNA called that shares one strand from each species?
12.what base replaces thymine?
Down
2.a plant with a single seed leaf (generally quite thin and long leaves)
3.what kind of bond holds DNA together?
5.a plant with two seed leaves
6.the type of comparison that uses antigens and antibodies
9.what base joins with cytosine?

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