Crabs have paddle-like appendages to help them swim called
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Chance or probability is the basis of genetic inheritance. what genes you inherit from your parents is nothing more than "chance". in this punnett square you can see the possible genes for fur color of mice. b is the gene for black and b is the gene for white. if you are black, the pair of genes you possess must be bb or bb. if your fur is white you have the combination bb.