In Dianne Dodd's experiments with Drosophila pseudoobscura, different populations were established that were raised on diets of either maltose or starch

When flies from the different populations were allowed to mate, some flies mated with flies fed on a different food source, but there was a preference for mating with flies raised on the same food source. What does this phenomenon illustrate about the timescale of speciation?


The process of speciation occurs over a long period of time, and this process can be observed under defined conditions in the laboratory.

Biology & Microbiology

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Secondary growth (thickening) arises from ____________________. Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

Which of the following represents the genotype of a male who is color-blind?

A. XbXb B. XBY C. XbY D. XBXB E. XBXb

Biology & Microbiology

Loosely packed chromatin is said to be in an open conformation.

Answer the following statement true (T) or false (F)

Biology & Microbiology

The deamination of cytosine generates a uracil base. This is a naturally occurring nucleic acid base, and so does not represent a DNA lesion caused by damage due to chemicals or irradiation

Why is this base recognized as "foreign" and why is it important for cells to have a mechanism to recognize and remove uracil when it is found in the DNA duplex?

Biology & Microbiology