Three genes (A, B, and C) are in the same chromosome. The distance between A and B is 1 map unit, between B and C is 4 map units, and between A and C is 3 map units. The correct order of genes in the chromosome is:
A. A, B, C
B. B, C, A
C. C, B, A
D. B, A, C
E. A, C, B
D
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What is the difference between a community and an ecosystem?
A. A community includes interacting populations with their surrounding environment, while an ecosystem does not include the surrounding environment. B. A community includes interacting populations without their surrounding environment, while an ecosystem includes the surrounding environment. C. A community and an ecosystem are the same thing in ecology. D. A community includes abiotic factors, while an ecosystem does not.
Two species of frog mate in the same pond. One breeds in early summer and one in late summer. This is an example of what kind of reproductive isolation?
A. pre-zygotic, behavioral isolation B. pre-zygotic, temporal separation C. pre-zygotic, ecological separation D. post-zygotic, temporal separation E. post-zygotic, ecological separation
As plants invaded the land, all of the following were true EXCEPT
A. there was a greater availability of light for photosynthesis. B. there was an increased threat of desiccation of unprotected cells. C. there was an increased threat from predation by animals. D. there was a greater concentration of carbon dioxide available in the atmosphere.
Which of the following structures is the last to develop?
a. neural tube b. neural groove c. neural crest d. neural folds e. neural plate