The technique of preparing mitotic chromosomes involves a staining procedure using Giemsa stain. One variation of this technique allows a low-resolution of chromosome bands while a second variation allows a high resolution. At low resolution we can see about ________ bands while at high resolution we see about ________ bands.
A) 300; 2000
B) 300; 1000
C) 100; 2000
D) 100; 1000
A) 300; 2000
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Sexual reproduction:
A. results in offspring that are not genetically identical. B. results from combining genetic material from two gametes. C. results in a new generation that is not genetically identical to its parents. D. results in a new generation with the same number of chromosomes as the parents. E. All of these choices are correct.
Your botany teacher is making assignments for a research project on a plant species. She assigns you to study hemlock (Conium maculatum) and mentions that is an r-selected species. Based on this, what characteristics would you predict to be true of hemlock? Check all that apply.
A. HABITAT: Disturbed areas like the edges of agricultural fields. B. LIFESPAN: Several decades. C. HABITAT: Pristine, undisturbed meadows. D. REPRODUCTION: Small numbers of large seeds produced. E. REPRODUCTION: Large numbers of seeds produced at a time. F. LIFESPAN: One to two years.
Which of the following taxa includes the largest amount of genetic diversity among plantlike organisms?
A) Embryophyta B) Viridiplantae C) Plantae D) Charophyceae E) Tracheophyta
All of the following would have been energy sources on primitive Earth EXCEPT
A. ultraviolet light. B. heat. C. oxidation of organic molecules. D. sunlight.