Because of a non-disjunction event occurring during meiosis, a particular egg has no X chromosome. This egg is fertilized by a normal Y carrying sperm. What is the genotype of the resulting zygote?
a) XXY
b) YO
c) XX
d) XO
Answer: b) YO
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Formation of a tetraploid plant species from two different diploid parental species of plants is an example of
A. punctuated equilibrium. B. gradualism. C. extinction. D. a postzygotic barrier to evolution. E. a prezygotic barrier to evolution.
The activities of macrophages
A. stimulate lymphocytes to carry on specific immunity. B. stimulate phagocytic neutrophils. C. are part of the nonspecific response against disease. D. do none of these things. E. are part of the nonspecific response against disease and stimulate phagocytic neutrophils.
Which of the following are examples of homologous structures?
A. Whale flipper and cat leg B. Human eye and octopus eye C. Bird and insect wings D. Body shape of sharks and dolphins E. Penguin wing and fish fin
Oxygen is mostly transported through the body in which of the following forms?
A) dissolved in the blood B) dissolved in red blood cells C) bound to hemoglobin D) bound to dissolved iron