The embryonic germ layer of tissue in animals that develops into the digestive tract and organs derived from the digestive tract is the
A. pachyderm.
B. ectoderm.
C. mesoderm.
D. endoderm.
E. protoderm.
Answer: D. endoderm.
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Look at Figure 45.17 in the textbook and consider the individual in the gray shaded box. What is the probability that this individual will pass on the A allele to its offspring?
A. 0.25 B. 0.5 C. 0.75 D. 1.0 E. None of the answer options is correct.
Which term describes new ecological opportunities that were not exploited by an ancestral organism?
a. hybrid zones b. fusion zones c. stability zones d. adaptive zones e. reinforcement zones
A couple has a child with Down syndrome. The mother is 39 years old at the time of delivery. Which of the following is the most probable cause of the child's condition?
A) The woman inherited this tendency from her parents. B) The mother had a chromosomal duplication. C) One member of the couple underwent nondisjunction in somatic cell production. D) The mother most likely underwent nondisjunction during gamete production.
Which of the following tools helps in the visualization of DNA inside a cell?
A. polarized light microscope B. visible light microscope C. fluorescent dye D. Gram staining E. scanning electron microscope