Conifers produce copious amounts of pollen during reproduction. What would be a likely consequence of a significant reduction in the amount of pollen produced by conifers?
A. There would be little effect because coevolved pollinators would still be able to transfer pollen from the male cones to the appropriate female cones.
B. There would be a significant negative effect on the viability of seeds because double fertilization could not occur, so there would be no food available for the growing embryo.
C. There would be a decrease in the number of seeds produced because the chances of pollen reaching a female cone of the same species would be reduced.
D. There would be a significant decrease in the genetic diversity of embryos, but little effect on the number of seeds as only one pollen grain is necessary to fertilize a single female cone.
C. There would be a decrease in the number of seeds produced because the chances of pollen reaching a female cone of the same species would be reduced.
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Answer the following statement true (T) or false (F)
Which of the following factors does not interfere with the interpretation of evolutionary time using the molecular clock?
A) Horizontal gene transfer B) Differences in generation time C) Mutations due to background cosmic radiation D) Different selection pressures on different taxonomic groups E) Differences in DNA repair efficiency in different taxonomic groups
Which technique did Rosalind Franklin use to determine many aspects of DNA's structure?
A. Transformation B. Transmission electron microscopy C. Density-gradient centrifugation D. X-ray crystallography E. Chromatography
Lily plants sometimes have twice as many chromosomes per cell as their parent plants had. Which of the following explains how this might have happened?
a. The lily's sister chromatids failed to separate during meiosis. b. The chromosome number of the lily went from 2n to n. c. The lily gametes fused during mitosis. d. The parent plant lost half of its chromosomes during mitosis.