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.
This means that almost any gene on the X, even if it is recessive in the female, will be expressed in males. These are referred to as X-linked genes. Genes found only on the Y chromosome are referred to as Y-linked genes, and expressed only in males. Genes on either sex chromosome can be called sex-linked genes. There are approximately 1,098 X-linked genes, though most of them are not for female anatomical characteristics. In fact, many are linked to disorders such as hemophilia, Duchenne muscular dystrophy, fragile-X syndrome and several others.