Which vitamin deficiency causes vision problems in children?

Premature ejaculation is the most common male sexual dysfunction

Indicate whether the statement is true or false

One result of the Human Genome Project is that scientists have

a. identified the genetic basis of about half of the known Mendelian single-gene disorders, b. developed methods of treating most of the known Mendelian single-gene disorders. c. learned how to prevent disorders such as PKU and Huntington’s disease. d. identified the genetic basis of all of the single-gene disorders.