Which of the following is a type of postzygotic
reproductive isolating mechanism?
a. temporal isolation
b. mechanical isolation
c. behavioral isolation
d. hybrid sterility
e. all of these
Answer: d
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Researchers trying to determine the genetic basis of a rare inherited disease have been examining the pedigrees of eight families affected with the disease
For three of the families the disease is coinherited with markers on chromosome 2, but for the other five families the disease is coinherited with markers from chromosome 10 . Why might this discrepancy occur? A. The same disease can be caused by defects in two or more genes on the same chromosome. B. The gene product of chromosome 2 silences the defect on chromosome 10 C. The same disease can be caused by defects in two or more genes on different chromosomes. D. Since more families showed linkage to chromosome 10, the disease gene is on chromosome 10 . The three families showing linkage to chromosome 2 are likely false positives.
Chapter 12 includes a discussion of the various defense mechanisms utilized by plants. Onion
plants have developed several creative means of discouraging their consumption by herbivores. The cells of the edible portion of the onion contain several different substances:alliinase (an enzyme) and sulfur compounds derived from the soil. When the cells of the onion are ruptured (as when they are bitten into by an animal), the substances combine. From your knowledge of onions, how would the new substance created by this combination deter its future consumption?
What will be an ideal response?Many rural communities object to nearby wilderness designations because they
A. depend on natural resources in the area. B. dislike and misunderstand wildlife. C. object to subsidies for wildlife. D. dislike having wilderness nearby. E. object to all of the campers and hikers who visit the area.
Which portion of DNA serves as the starting point for a gene?
a. promoter b. nucleotide cap c. codon d. transcript e. polymerase