A.
Neither parent was a carrier of the gene. B.
Both parents were carriers. C.
This individual is protected by the presence of a normal gene. D.
The individual is not able to reproduce. Answer each question by clicking the correct blue button. Only the first answer
selected is graded.
1. Why does a person with only one copy of a defective gene often not get the disorder associated with the gene?
A.
Neither parent was a carrier of the gene.
B.
Both parents were carriers.
C.
This individual is protected by the presence of a normal gene.
D.
The individual is not able to reproduce.
A. They
are always passed on to future generations. B.They
are often random events. C.They
only occur in sex cells. D.Variation
that results from mutations is fundamental to the evolution of a species.3. In fruit flies with the curly wing mutation, the wings will be straight if the flies are kept at 16 degrees Celsius. The most probable explanation for this is that:
A.
fruit flies with curly wings cannot survive at high temperatures.
B.
the environment influences wing phenotype in these fruit flies.
C.height
temperatures increases the rate of mutations.
D.
wing length in these fruit flies is directly proportional to the increase in
temperature.
4. The concept that new varieties of organisms are still evolving is
best supported by the:
A.
increasing need for new antibiotics.
B.
increasing number of individuals in the human population.
C.
decreasing number of new fossils discovered in undisturbed rock layers.
D.
decreasing activity of photosynthetic organisms due to warming of the atmosphere.
5. Mutations can be considered as one of the raw materials of evolution
because they:
A.
contribute to new variations in organisms.
B.
are usually related to the environment in which they appear.
C.
are usually beneficial to the organism in which they appear.
D.
usually cause species of organisms to become extinct.
Grade exam.