One concern of conservation biologists is that endangered species will have low genetic diversity due to a small population size. Why is this a concern?
A. Allele frequencies are lower in smaller populations.
B. If the environment changes, individuals will not be able to change their alleles and survive.
C. If a disease occurs in the population, there may not be organisms with resistant alleles.
D. Individuals in small populations acquire mutations more slowly than those in large populations.
E. Sexual selection is stronger in small populations.
C. If a disease occurs in the population, there may not be organisms with resistant alleles.
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Four of the five species listed below are those in
which the females cluster and the males fight. Select the exception. a. dogs b. lions c. elk d. bison e. bighorn sheep
Xeroderma pigmentosum is caused by
a. a thymine dimer. b. a translocation. c. a deletion. d. an inversion. e. a duplication.
Which of the following best illustrates ecological succession?
a. overgrazing causes a nutrient loss from soil b. grass grows on a sand dune, is replaced by shrubs, and then by trees c. introduced pheasants increase, and native quail populations disappear d. decomposition in soil releases nitrogen that plants can use e. a mouse eats seeds, and an owl eats the mouse
The respiratory control center is located in the
A) diaphragm. B) cortex. C) medulla. D) hypothalamus. E) spinal cord.