The marsupials in Australia closely resemble the placental animals of the rest of the world. This is an example of
A. the fossil record.
B. homology.
C. convergent evolution.
D. biogeography.
E. development.
C. convergent evolution.
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In human oogenesis, how many chromosomes does a primary oocyte carry?
A) 22 B) 23 C) 44 D) 46 E) 92
Which enzyme elongates the new DNA strand starting at an RNA primer?
A) DNA polymerase I B) DNA polymerase III C) RNA primase D) DNA ligase E) RNA polymerase
What is an advantage for using Arabidopsis to study plant development and genetics?
a. The Arabidopsis genome is largely unstudied, and therefore there is a lot that scientists can learn. b. Arabidopsis mutants can be easily induced with chemicals. c. There are no developmental mutants in Arabidopsis, therefore, normal development can be studied easily. d. This plant completes its life cycle in just a few months. e. This plant is a weed of no economic importance
Males tend to be affected in greater numbers by X-linked recessive genetic disorders than are females because
A. expression of the recessive gene is inactivated by the other X chromosome in females. B. males have only one X chromosome. C. males have a double dose of the gene. D. Y chromosomes are destabilized by the X chromosomes. E. females have only one X chromosome.