If you have any non-numeric character in the character variable the output will be missing and your log will contain a. NOTE: Invalid Data message everytime you have a non-numeric character in your data. So you could get 10, 20, 50 or more notes in your log.
1. A man with hemophilia (a recessive, sex-linked blood clotting disorder) has a daughter of normal phenotype. She marries a man who is normal for the trait. XH-normal. Xh-hemophilia. Since this is a recessive disorder, one XH allele will give a normal phenotype. When the offspring do not have a XH and only have the Xh allele/alleles they will have the hemophilia condition. Man's genotype is XhY. Daughter's genotype is XHXh (She got the Xh from her father.
sex-linked. referring to a pattern of inheritance characteristic of genes located on one type of sex chromosome (for example X) and not found on the other type (for example Y); in mammals, in almost all cases, the gene controlling the trait is on the X chromosome so this pattern is often called X-linked.