1. The arrows in the diagram below indicate the development of four different varieties of vegetable plants from wild mustard.

Each of these varieties was most likely produced as a result of

(1) asexual reproduction in the wild for many years

(2) changes in light availability

(3) competition between plants

(4) selective breeding over many generations

 

2. The shape of a protein is most directly determined by the

(1) amount of energy available for synthesis of the protein

(2) kind and sequence of amino acids in the protein

(3) type and number of DNA molecules in a cell

(4) mistakes made when the DNA is copied