The Great Dane and Chihuahua are both domestic dogs, the same species. However, mating between them is limited by:
A) hybrid infertility. B) behavioral isolation.
C) mechanical incompatibility. D) heterozygote disadvantage.
Answer: C
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The 2+ in Cu2+ tells us that this atom ________.
A. has two more neutrons than protons B. has two more electrons than protons C. has two more protons than electrons D. has two more electrons than neutrons
Which of the following statements about communication in the White-Crowned Sparrow is not correct?
A. The White-Crowned Sparrow's song is an advertisement display behavior. B. The White-Crowned Sparrow's song is learned by imprinting, a sensitive period that takes place about 10–50 days after hatching. C. During the learning phase, the White- Crowned Sparrow's subsong is a sequence of unstructured twittering. D. If a tape of another species song, for example the Swamp Sparrow, is played during the sensitive period, the White- Crowned male will learn that song. E. If deprived of hearing the adult male's song during the early sensitive period, the bird will continue to sing an unstructured twittering throughout its life.
The female gametophyte of a flower develops within a(n) ____
a. stigma b. anther c. calyx d. corolla e. ovule
Life history patterns:
a. have no genetic component. b. are subject to the pressures of natural selection. c. exist only in organisms that exhibit parental care.