Investigations into the genetics of obesity have revealed that _____
1.in humans, obesity is believed to be controlled by a single gene interacting with the environment
2.obesity is an autosomal dominant trait
3.humans and mice both have a gene for leptin, which is thought to regulate energy storage
4.mutations probably account for the explosive increase in obesity in developed countries
3
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A group of turtles is washed ashore on an island and no longer breeds with any turtles other than those on the island. After centuries of isolation, they no longer interbreed with the original species
This situation is best described by the term: A. allopatric speciation. B. migration. C. phylogenetic speciation. D. genetic drift. E. natural selection.
The purpose of a photosystem is to convert ____
a. light energy into chemical energy b. carbon dioxide into sugar c. light energy into sugar d. oxygen into carbon dioxide e. light into oxygen
A food web is
A. a long food chain. B. several food chains that intersect. C. a trap to catch food. D. a complicated series of passages of energy via the first law of thermodynamics.
Horses and donkeys mate successfully to produce mules, which are always sterile. Which genetic isolating mechanism is involved here to prevent horses and donkeys from becoming a single species?
A) gametic isolation B) hybrid infertility C) behavioral isolation D) mechanical isolation