____________1. Is a molecule which stores genetic information a directs the development of the biochemical homeostatic and physiological characteristics of organism

_____________2.  is a segment of DNA that may code one trait

_____________3.   An American molecular biologist who unraveled the structure of DNA

_____________4. consists of base pairs

-----py----------------5. always  pair up with a purine

_____________6. always pair up with adenine

_____________7. always pair up cytosine

_____________8. replaces thymine in mRNA

_________9.  is a mutation that exchanges one base for another, such as switching an A to a G).

____________10.  are mutations in which extra base pairs are inserted into a new place in the

DNA.

____________11. is a change on the structure of a gene resulting from a variant form that may be transmitted to subsequent generation.

_____________12. is caused by the mutation of the gene responsible for the production of the skin pigment, melanin.

_____________13. results from mutations of the gene that controls the production of the protein hemoglobin

_____________14. can be in the form of radiation, chemicals, extremes of temperature and even microbial infections

_____________15.  the codon is divided into codons three bases long insertions and deletions can alter a gene so that its message is no longer correctly paired.

____________16. are mutations in which a section of DNA is lost.

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