A mutant gene that produces brown eyes (bw) is located on chromosome #2 of Drosophila melanogaster, whereas a mutant gene producing bright red eyes, scarlet (st), is located on chromosome #3. Phenotypically, wild-type flies (with dull red eyes), whose
mothers had brown eyes and whose fathers had scarlet eyes, were mated. The 800 offspring possessed the following phenotypes: wild type (dull red), white, scarlet (bright red), and brown. Most of the 800 offspring had wild-type eyes, whereas those with white eyes were the least frequent.
From the information presented above, how many white-eyed flies would you expect in the F2 generation?
A) 50 B) 150 C) 350 D) 450 E) 200
Answer: A
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The trade winds in the zone from 0 to 30 degrees
north latitude are generally from the a. north. b. northwest. c. northeast. d. southeast. e. southwest.
The process of ________ has had a major impact on species distributions worldwide
A) continental drift B) comparative biochemistry C) genetic engineering D) divergent speciation E) adaptive mobility
Organic chemicals always have a basic framework of the element ________ bonded to other atoms.
Fill in the blank(s) with the appropriate word(s).
Contrast
(a) is the amount that an object’s image is enlarged. (b) is the extent to which detail in an image is preserved during the magnifying process. (c) is the degree to which image details stand out against their background. (d) focuses light rays emanating from an object to produce an image.