Which of the following most often leads to allopatric speciation?
A. Habitat isolation
B. Mating time differences
C. Gametic incompatibility
D. Behavioral isolation
Answer: A
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Which of the following is true of DNA polymerase I?
A. It carries out lagging strand synthesis. B. It does not require the presence of a 3'-OH in order to initiate synthesis of DNA. C. It is responsible for RNA primer removal and replacement with DNA nucleotides. D. It seals the gaps or nicks produced during lagging strand synthesis. E. All of these choices are correct.
What is the main premise of the blending theory of inheritance that predominated before 1900?
a. We inherit traits from both of our parents. b. Traits are inherited via a mixing of parental blood. c. You're a perfect blend of traits from both of your biological parents. d. It explains the inheritance patterns of traits that skip a generation. e. It explains why children of one tall parent and one short parent generally have an adult height midway between their parents' heights.
In rabbits, there are four alleles at the c locus. Arranged in dominance sequence they are:C
(agouti), cch(chinchilla), ch(Himalayan), and c (albino) (a) Is it possible to cross two agouti rabbits and produce both chinchilla and Himalayan offspring? (b) Is it possible to cross two chinchillas and produce 1/2 chinchilla and 1/2 Himalayan? What will be an ideal response?
Chromosomes are duplicated during which part of the cell cycle
A) G1 B) G2 C) S D) M