When a farmer grows cotton containing the gene for Bt toxin, they often leave a strip of non-Bt cotton around the outside of the field for what reason? Select one:
a. to allow some rr bollworm caterpillars to survive
b. to allow the non-Bt and Bt cotton plants to cross pollinate
c. because the non-Bt cotton does not drive the moths and caterpillars to extinction
d. because the non-Bt cotton grows better
e. to allow some RR bollworm caterpillars to survive and limit selection pressure for resistance
e. to allow some RR bollworm caterpillars to survive and limit selection pressure for resistance
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Which of the following pairs is incorrectly matched for cells and the molecules they secrete?
A. Neutrophils; heparin B. Basophils; heparin C. Mast cells; histamine D. Natural killer cells; toxic chemicals E. Eosinophils; toxic chemicals
If a diploid organism has a genome consisting of 4 chromosomes, it can produce ____ different combinations of chromosomes (disregarding crossing over)
a. 4 b. 8 c. 12 d. 16 e. 64
Patterns of temperature and ________ resulting from regional variations in climate are the major determinant of regional and global patterns of vegetation distribution
Fill in the blank(s) with correct word
Both a man and a woman are heterozygous for freckles. Freckles ( F) are dominant over no freckles ( f). What is the chance that their child will have freckles?
a) 100% b) 25% c) 50% d) 0% e) 75%