A central role for chromosomes in heredity was first suggested by
A. Gregor Mendel.
B. Walter Sutton.
C. Thomas Hunt Morgan.
D. Karl Correns.
Answer: D
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The active ingredient in Ecstacy is
a. MDA. b. MDMA. c. MMA. d. LSD. e. STP.
The reason why some individuals who inherit polydactyly (having an extra digit on the hand or feet) do not express the trait is due to
A. incomplete penetrance. B. gene linkage. C. pleiotropy. D. incomplete dominance. E. None of the answers are correct.
Scottish scientist cloned Dolly from another sheep in 1997. They took an egg cell from a sheep (Mom 1) and removed and discarded the nucleus. They took an udder cell nucleus, that was diploid, from a different sheep (Mom 2). They inserted the nucleus into the egg cell and made this new cell undergo mitosis. They implanted the dividing cell into a surrogate mother (MOM 3). Several months later, Dolly was born. Dolly was actually a clone of which sheep?
a) Mom 1 b) Mom 2 c) Mom 3 d) there is not enough information given to answer this question
Four of the following are advantages that led to an evolutionary shift toward bipedalism. Which one is the exception?
A. It allows for more efficient movement across open ground. B. It made upright walking more energy efficient. C. It keeps the body cooler. D. It allows for better stereoscopic vision. E. It is easier to scan the horizon for predators.