Explain why organisms undergoing rapid evolutionary change often contain relatively large numbers of mobile DNA elements, whereas once organisms settle into a stable evolutionary niche, most of these mobile elements are lost
What will be an ideal response?
Answer: Genome diversity is likely to be high during a process of rapid evolutionary change. To obtain this high diversity, several processes, such as horizontal gene transfer and chromosomal rearrangements (e.g., deletions, inversions, translocations), are common. Organisms with a more stable niche require less diversity in their genomes and therefore tend to be less dynamic in genome content.
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A small population of Dutch settled in South
Africa in the 17th century and became known as Afrikaners. By chance, a few Dutch settlers carried the gene for Huntington’s disease. Today Huntington’s disease occurs at a relatively high frequency in this population. This is an example of
a. the bottleneck effect. b. the founder effect. c. gene flow. d. the Red Queen effect. e. natural selection.
What is a hydrophobic region?
What will be an ideal response?
Match the nutritional category of microbe to its source of carbon and its energy source. Chemoautotroph
A) Carbon dioxide and simple inorganic chemicals B) Organic carbon and metabolic conversion of the nutrients from other organisms C) Organic carbon and sunlight D) Carbon dioxide and sunlight
The outside of a neuron is positively charged at resting potential. Why don't negative ions exit from the cell to normalize charge across the membrane?
A. All of the chloride ions are already outside the cell. B. The negative charge inside the cell is carried by large proteins that cannot diffuse through the membrane. C. There are no negative ions inside the cell. D. The positive charge outside the cell repels negative ions.