Crossing-over takes place in bivalents (tetrads) consisting of ________ chromatids, and one crossover involves ________ chromatids.
A) 2; 2
B) 2; 4
C) 4; 2
D) 4; 4
E) 8; 4
C) 4; 2
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What is formed when an atom loses or gains an electron?
a. a molecule b. an ion c. a compound d. a mixture e. a solvent
________ selection and ________ selection tend to reduce the amount of variation in a population, whereas ________ selection tends to increase the amount of variation in a population
Fill in the blank(s) with correct word
Melatonin is produced by the pineal gland
____________________
A mutation arises in an individual that decreases its fitness. This means that this individual's
A. ability to migrate long distances will decrease. B. probability of survival will decrease. C. contribution to the gene pool of the next generation will decrease. D. ability to find food will decrease. E. likelihood of having healthy offspring will increase.