Only one amino acid was altered in each mutant TrpA protein. A single amino acid in the TrpA protein could be altered in different ways in different trpA- mutants. Three of the amino acid changes were alterations of an original Gly amino acid. The sites of the point mutations in the different trpA- mutants correlated in a linear manner with the altered amino acids in the different mutant TrpA proteins. More trpA- mutations occurred at the 3' end of the coding region than in the 5' end. Some of the trpA- mutants were nonsense mutations and others were missense mutations. True or false?

Considering the yellow and green pea color phenotypes studied by gregor mendel: a. what is the biochemical function of the protein that is specified by the gene responsible for the pea color phenotype? (1 point) b. a null allele of a gene is an allele that does not specify (or encode) any of the biochemical function that the gene normally provides (in other words, either no protein at all or only non-functional protein is produced from it). of the two alleles, y and y, which is more likely to be a null allele? (1 point) c. in terms of the underlying biochemistry, why is the y allele dominant to the y allele? (2 points) d. why are peas that are yy homozygotes green? (1 point) e. the amount of protein produced from a gene is roughly proportional to the number of functional copies of the gene carried by a cell or individual. what do the phenotypes of yy homozygotes, yy heterozygotes, and yy homozygotes tell us about the amount of sgr enzyme needed to produce a yellow color? explain your reasoning. (2 points)