Which situation allows for evolution during gene duplication? a. existing genes are copied over generations. b. the original gene performs the same role as the mutated gene. c. the original gene never duplicates. d. a mutation occurs in one copy of the original gene.

What are genotypes? what are phenotypes?

The empty trna moves off and picks up another matching amino acid from the cytoplasm in the cell. the anticodon of the trna, with its attached amino acid, pairs to the codon of the mrna, which is attached to a ribosome. this sequence is repeated until the ribosome reaches a stop codon on the mrna, which signals the end of protein synthesis. the ribosome forms a peptide bond between the amino acids, and an amino acid chain begins to form. when a second trna with its specific amino acid pairs to the next codon in sequence, the attached amino acid breaks from the first trna and is bonded to the amino acid of the second trna.

Eutrophication caused by human nutrient pollution.