WHICH LETTER GOES WITH EACH QUESTION
 -
 The different forms of a gene are each called an __________.
 -
 Traits are features that are coded for in _________ and can be inherited.
 -
 ___________ developed principles of genetics by experimenting with pea plants.
 -
 The temperature in which an organism lives is an example of an __________ environmental influence.
 -
 The law of ___________ states that a parent can pass only one allele for each trait to its offspring.
 -
 The trait that only appears when both alleles are present is called __________.
 -
 A sequence of DNA that directs a cell to make a protein is a ________.
 -
 Millions of __________ have become extinct in the history of the Earth.
 A. 
 allele
 B. 
 segregation
 C. 
 species
 D. 
 gene
 E. 
 recessive
 F. 
 DNA
 G. 
 Mendel
 H. 
 dominant
 I. 
 external