Assuming that the genes are on separate chromosomes, an organism with the genotype AaBb will make gametes in the following proportions: 1/4 AB, 1/4 Ab, 1/4 aB, and 1/4 ab. What process produces such results?
A) independent assortment
B) mutation
C) random fertilization
D) segregation
A
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A pollen grain in a plant represents the ________
A. male gametophyte B. female gametophyte C. male sporophyte D. female sporophyte
Many scientists feel that we are headed toward another mass extinction because of man's actions and our effect on the ecosystem Earth. What have we learned from previous mass extinctions that may provide an idea of the consequences of such a mass extinction? What should man do to try to prevent such an occurrence?
What will be an ideal response?
Which of the following was found to be the
main ozone destroying gas?
a. chlorofluorocarbons b. carbon dioxide c. methylmercury d. methane e. nitrogen
_____ refers to the process by which microbes gain a more stable foothold at the portal of entry though interaction of their molecules with host cell receptors.
Fill in the blank(s) with the appropriate word(s).