THE NATURE and SCOPE OF PSYCHOLOGY LESSON AIM Define psychology and explain basic theoretic approaches Despite their interest in the subject, students of psychology often find it difficult to answer this basic question in a clear, concise an d specific manner.
X-linked recessive inheritance is a mode of inheritance in which a mutation in a gene on the X chromosome causes the phenotype to be expressed in males (who are necessarily hemizygous for the gene mutation because they have one X and one Y chromosome) and in females who are homozygous for the gene mutation, see zygosity.
Whereas in women, where having only one mutant allele will not cause the disease, in men, having only one mutant allele WILL cause the disease. Due to simple probabilities, it is far more common to obtain one mutant allele than two, so therefore these types of disorders will affect men moreso than women.