Tay-Sachs is a single gene recessive allele. The disease always kills its victims before they can reproduce (and potentially pass on the defective allele). If every Tay-Sachs child dies before their 5th birthday, how does the defective allele get passed on to other babies?

You have just sequenced a new protein found in mice and observe that sulfur-containing cysteine residues occur at regular intervals. what is the significance of this finding? it will be important to include cysteine in the diet of the mice. cysteine residues are required for the formation of α helices and β pleated sheets. cysteine residues are involved in disulfide bridges that form tertiary structure. cysteine causes bends, or angles, to occur in the tertiary structure of proteins.