Sexual reproduction brings about genetic variation within a species. How does sexual reproduction contribute to variation? Why is genetic variation so important to the survival of a species? Support your answer with an example.
What will be an ideal response?
Answers may vary. Genetic recombination, independent assortment of homologous chromosomes, and the union of egg and sperm in sexual reproduction create offspring with a different set of alleles than their parents. These processes brings about great genetic variability, which is extremely important to the survival of a species in the ever-changing environments of the earth. With variation, a species will exhibit a variety of traits that may react differently to different environments. A limited number of traits may allow the organisms to fit very nicely into their present environment. In time, the environment may change, and these limited traits may no longer allow the species to thrive in this new environment. The presence of other (alternate) traits may allow some offspring to survive and reproduce better than others under the new conditions. An example would be the mutant type of Daphnia water flea, which prefers warmer water than the original type. If the earth's waters warmed with global warming, the mutant would be favored and the original type would not thrive.
You might also like to view...
Describe the four common measurement tools for strategic human resource management.
What will be an ideal response?
Maria drives a four-door sedan to work and other places every day. How does her car affect the environment now compared to a similar car thirty years ago?
A. A car is a car, so the environmental impact is likely the same. B. Her car is more economical today than it would have been thirty years ago. C. There are so many cars today that air pollution laws are nearly worthless. D. Today's car has a pollution-control device that reduces harmful emissions. E. Technology now produces cars that are completely harmless to the environment.
What is a tenancy at will?
A. a tenancy created when a lease specifies intervals at which payments are due, but does not specify the duration of the lease B. a tenancy created by a lease that may be terminated at any time by either party C. a tenancy created when a tenant retains possession of property after the expiration of another tenancy D. a tenancy created when a landlord and a tenant agree on a specific duration for a lease
The UCC's purpose is:
a. to give each state a unique set of trade laws b. to mediate international business disputes c. to make it easier to prosecute parties who breach contracts d. to reduce taxes e. none of the other choices are correct