Which process describes how many pure-bred dogs have been produced? A. Cloning
B. Crossbreeding
C. Selective breeding

Which best explains why there are 64 possible codons in the genetic code and only 20 amino acids that make protiens of living organisms on earth

Dna is colied into chromosomes in a cell

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays