1. A man with hemophila (a recessive, sex-linked condition) has a daughter of normal phenotype. She marries a man who is normal for the trait. What is the probability that a daughter of this mating will be a hemophiliac? That a son will be a hemophiliac? If the couple has four sons, what is the probability that all four will be born with hemophilia?
a ) 1/5 b ) 0; 1/2, 1/16 c ) neither
2. Which chromosme are the diseases, hemophilia, color blindeness, and Duchenne muscular dystrophy located?
a ) X chromosome b ) Y chromosome c ) neither
3. What causes human disorders?
a ) Changes in the number of chromosomes per cell b ) cell malfunctioning c ) neither or in the structure of individual chromosomes
4. What is a karyotype?
a ) shows the full set of chromosomes of an individual arranged in sequence b ) calculation of diseases c ) a medicine
5. Pseudohypertrophic muscular dystrophy is an inherited disorder that causes gradual deterioration of the muscles. It is seen almost exclusively in boys born to apparently normal parents and usually results in death in the early teens. Is this disorder caused by a dominant or a recessive allele? Is its inheritance sex-linked or autosomal?
a ) dominant; autosomal b ) neither c ) recessive; sex-linked
6. What pattern of inheritance would lead a geneticist to suspect that an inherited disorder of cell metabolsim is due to a defective mitochondrial gene?
a ) inherited from mother b ) inherited from father c ) neither
