Before contact with Europeans, a tiny, isolated group of South Pacific islands had a population of about 50,000 people. Because of poor management of their own resources, the population fell to around 5000 by about the year 1750. When Europeans finally
arrived, they brought smallpox, and after the ensuing epidemic, only about 800 islanders were left alive. The unusual genetic makeup of the native population is due to what phenomenon?
A) speciation B) gene flow C) genetic drift D) bottleneck effect
Answer: D
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Blood glucose levels are regulated by ____ , in which an increase or decrease in glucose signals the pancreas to stop producing glucagon or insulin (respectively)
Fill in the blank with the appropriate word.
Which of the following sex-linked disorders was common among the royal families of Europe, and all of the affected males could trace their ancestry to Queen Victoria of England?
A) fragile X syndrome B) hemophilia C) color-blindness D) Duchenne muscular dystrophy E) None of the answer choices is true.
What body systems may be impacted if a mother drinks alcohol during pregnancy and causes developmental problems to the endoderm?
A. The outer layers of the digestive and respiratory systems may not be as functional as they should. B. The epithelial lining of the digestive and respiratory systems may not be as functional as they should be. C. The epithelial lining of the digestive and reproductive systems may not be as functional as they should be. D. The epidermis and the epithelial lining of the oral cavity may not be as functional as they should.
Protein that forms a channel to allow a particular molecule or ion to cross the plasma membrane.
What will be an ideal response?