What is the effect of genetic drift on evolution? How does the founder effect work to cause change in allele frequency?
What will be an ideal response?
As we saw with the aftermath of the typhoon on Pingelap atoll, populations sometimes start with a small number of individuals, or founders. Alleles carried by the founders, whether they are advantageous or detrimental, become established in the new population. These events take place simply by chance and are known as founder effects. Changes in allele frequency that occur by chance from generation to generation in small populations are examples of genetic drift. The impact of genetic drift is magnified in small populations. On Pingelap, frequency of the mutant allele increased from 2.5% to 18–20% in just over 200 years.
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Arthropods have which of the following features?
a. an open circulatory system b. a three-chambered heart c. a mantle cavity d. a radula
The complete genetic information of a person is isolated from some of her cells, cut with restriction enzymes, and the
resulting fragments inserted into cloning vectors. Next, the recombinant DNA molecules are introduced into bacteria for cloning purposes. This describes the procedure for creating a(n) ____.
a. genetic library b. mRNA library c. gene library d. DNA library e. nucleotide library
Which process is the driving force behind the movement of xylem sap upward through the tracheids and vessels in xylem?
1.Bulk flow 2.Osmosis 3.Plasmolysis 4.Transpiration
Populations of different kinds of organisms that interact with one another in a particular place are known as
A. ecosystems. B. communities. C. a biosphere. D. a commune.