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

Biology & Microbiology

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________ 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

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Melatonin is produced by the pineal gland

____________________

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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.

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