What are dominant and recessive alleles?
For a genetic trait, one only needs to have one dominant allele for the trait to show. For a recessive allele, there must be a two of them to be expressed over the dominant allele.
Examples?
A dominant allele would be brown eyes.
A recessive allele would be blue eyes.
References:
http://image.shutterstock.com/display_pic_with_logo/295258/295258,1300200863,2/stock-vector-vector-cartoon-illustration-of-a-cute-pug-puppy-dog-with-really-big-brown-eyes-73211188.jpg
http://cdn2.mixrmedia.com/wp-uploads/wirebot/blog/2010/10/mew_2.jpg
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