Which three components are common to all amino acids?

An amino acid is usually considered as the building block of a protein, is a constituent that plays a significant function in the body. The amino acids are required for essential activities like the synthesis of neurotransmitters and hormones and manufacturing of proteins.  

There are different kinds of amino acids found, however, all these amino acids possess three constituents, which are common to all the amino acids. These are an amino group, a carboxyl group, and an R group.  

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the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

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