What is the benefit of mutations?
A) They create cancerous cells, which grow faster than others.
B) They increase the shuffling of existing genetic information.
C) They add new genetic information upon which evolution can act.
D) They eliminate unneeded regions of chromosomes.
Answer: C
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What observation by Thomas Hunt Morgan led to the understanding that genes were on chromosomes?
A. The white-eyed trait was recessive and disappeared in the F1 generation. B. In a cross of a red-eyed female and a white-eyed male, only females in the F2 generation were white-eyed. C. The inheritance of the white-eyed trait in fruit flies followed the same pattern of inheritance as that of the X chromosome. D. The inheritance of the white-eyed trait in fruit flies followed the same pattern of inheritance as that of the Y chromosome. E. Inheritance of the white-eyed trait was the same for female and male flies.
The term that refers to the purposeful addition of microorganisms into a laboratory nutrient medium is ________.
A. immunization B. isolation C. contamination D. infection E. inoculation
Which forms the outermost whorl of flower parts?
a. sepals b. petals c. anthers d. pistils e. stamens
When does an atom becomes a cation?
a. It emits radiation. b. It shares electrons. c. It loses one or more electron. d. It gains one or more electron. e. One or more of its electrons changes energy levels.