Which of the following enzymes is responsible for DNA synthesis during replication?
a. deoxyribonuclease
b. polymerase
c. helicase
d. primase
e. None of the above
Ans: b
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When Mendel crossed two plants that were heterozygous for a single trait, what was the genotypic ratio of their offspring?
A. 1:2:1 B. 9:3:3:1 C. 3:1 D. 1:1 E. Varied depending on the trait
The gene pool of the next generation is derived from
A. all individuals of a population. B. only the female members of a population. C. those individuals of a population that reproduce and have viable offspring. D. individuals in a population that choose to contribute. E. only the male members of a population.
Two pure-breeding phlox plants were crossed, one with dark-blue flowers and the other with pink flowers. The F1 generation all had dark-blue flowers. When the F1 were crossed with each other, the F2 generation consisted of 176 plants: 101 with dark-blue flowers, 33 with light-blue flowers, 30 with red flowers, and 10 with pink flowers. How is flower color controlled in phlox?
A) one gene with four alleles B) one gene with two codominant alleles C) two genes whose alleles interact additively D) two genes with dominant epistasis
Electrons inside a shell travel in
a. straight paths. b. orbitals c. zigzag patterns d. two dimensions e. one dimension