Discuss the advantages and disadvantages associated with asexual and sexual reproduction. What will be an ideal response?
Asexual reproduction is faster and more energetically efficient than sexual reproduction
because in that latter, the animal must utilize energy to produce gametes and find a mate.
However, in asexual reproduction all the offspring are genetically identical to the parent, and
in sexual reproduction the offspring are genetically different. Sexual reproduction thus results
in genetic variability in the population, which increases the chances that some of the
offspring will survive in that particular environment or if that environment later changes.
Sexual reproduction is also thought to provide a better mechanism for spreading beneficial
mutations through the population as well as a better mechanism for more efficiently
removing harmful mutations.
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Cytokinesis is always tied to division of the nucleus
a. True b. False
Which of the following was the most likely
food source for first terrestrial tetrapods?
a. leaves b. insects c. small mammals d. worms e. eggs
Immunotherapy works on the basis of
A. helping the body to distinguish "self" cells from "nonself" cells and to destroy only the "self" cells. B. using small packets of radioactive materials that are injected into the bloodstream to remove cancerous cells in the bloodstream. C. using radiation to destroy the DNA of cancerous cells, preventing them from further cell division. D. using chemicals to target cancerous cells, preventing them from further cell division. E. helping the body to distinguish "self" cells from "non-self" cells and to destroy only the "nonself" cells.
A mutation that acts solely by affecting the properties of the contiguous sequence of DNA is called a __________
a. frameshift mutation b. trans-acting mutation c. cis-acting mutation d. nonsense mutation e. silent mutation