A type of muscular dystrophy shows sex-linked recessive inheritance. Affected persons usually die by the age of 20. Suppose that a boy with the disease lives long enough to marry a woman heterozygous for the trait

If they have a son, what is the probability that he will have the disease?
A) 0% B) 75% C) 50% D) 100% E) 25%


C

Biology & Microbiology

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Blood pressure is greatest in the ____

a. arterioles b. arteries c. capillaries d. veins e. venules

Biology & Microbiology

After much debate, it is decided that the family will vacation at Myrtle Beach in South Carolina this year. Swimsuits and other beach accoutrements are purchased and packed. Unfortunately, upon arrival, they are faced with signs that say, “WARNING! Beware: Portuguese men-of-war have been spotted along the shore! Beaches closed until further notice.” Upon returning home, the oldest child exclaims, “I never thought jellyfish could ruin our whole vacation!” The parents frown at the child, for they are biologists and he has committed a grave taxonomic error. What error has he made?

a. Portuguese men-of-war are not jellyfish, they are Scyphozoans. b. Portuguese men-of-war are not jellyfish, they are Anthozoans. c. Portuguese men-of-war are not jellyfish, they are Hydrozoans. d. Portuguese men-of-war are not jellyfish, they are Cubozoans.

Biology & Microbiology

When atoms gain or lose electrons, they become negatively or positively charged. These negatively or positively charged atoms are known as

A. isomers. B. unstable atoms. C. ions. D. isotopes.

Biology & Microbiology

A cystic fibrosis patient develops a severe respiratory infection that resists treatment with standard antibiotics. A specimen from the lungs is greenish in color and contains aerobic motile Gram-negative bacilli. The bacteria are oxidase positive. The patient is probably infected with

A. Bordetella pertussis. B. Burkholderia cepacia. C. Klebsiella pneumoniae. D. Pseudomonas aeruginosa. E. Serratia marcescens.

Biology & Microbiology