The figure below shows the results of a selection experiment in the laboratory in which two Drosophila repli-cate lines were selected for longer life span. Which of the following is the most accurate conclusion that you can draw from this data?
a. There is a genetic basis for longevity in Drosophila.
b. There is heritable variation for longevity in a Drosophila population.
c. Senescence is heritable in Drosophila.
d. The slope of a fitted line through the data points would provide an estimate of the heritability of longevity.
B
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Increasingly population density will most
likely lead to which type of distribution pattern?
a. clumped b. random c. uniform d. uniform and clumped e. random and clumped
Which term refers to the process in which DNA can be introduced into host bacterial cells?
What will be an ideal response?
The job of the placenta is primarily associated with
A. nourishment and waste removal. B. separation of the layers of embryonic tissue. C. protection of the fetus from infection. D. development of the outermost tissue of the embryo.
When it is important to count the number of cells, determine cell size and differentiate between dead and live cells a ________ is used.
A. plate count B. SEM C. flow cytometer D. methylene dye indicator E. Coulter counter