The immature angiosperm pollen grain consists of a tube cell and a generative cell that will divide to produce ________ sperm cells
A) one B) two C) three D) four
B
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How did Bateson and Punnett's work with comb morphology in chickens differ from the dihybrid work of Mendel?
A. They were working with sex-limited traits. B. Their F2 offspring displayed 4 unique phenotypes, not the four combinations of two phenotypes expected in a Mendelian cross. C. ½ of their combinations were lethal. D. The expression of their trait varied by the environment in which the chickens were raised.
Which of the following would be considered a
carrier of a sex-linked recessive defect?
a. a man with the defect b. a woman with the defect c. a father of a son with the defect d. the normal daughter whose father had the defect e. a son of two unaffected parents
What are male gametes called?:
a. ova b. sperm c. testes d. testosterone
Which of the following drugs inhibits nucleic acid synthesis specifically in most bacteria?
A. fluoroquinolones B. actinomycin C. rifampin D. tetracycline E. 5-fluorocytosine