If a mother already has a child with chromosomal abnormalities, the risk of having another child with
chromosomal abnormalities is 10 percent. Indicate whether the statement is true or false.
F
You might also like to view...
If a helical turn is removed from a closed-circular DNA molecule:
A. only supercoiling will occur. B. only strand separation will occur. C. supercoiling and/or strand separation will occur. D. cruciform DNA will likely form. E. solenoidal DNA will likely form.
The movement of NH4+ ions into a cell down an electrochemical gradient created by H+ pumping is an example of
____.
a. an ion pump b. passive diffusion c. facilitated diffusion d. secondary active transport e. passive transport
Your friend is an amateur aquarist learning to breed clownfish. She had one successful clutch of eggs, and moved the mother and fry with their anemone to a separate tank leaving only male fish behind. Now, she is surprised to find that a new female fish has appeared in the original tank. What is the most likely explanation for this?
A. Some anemone species secrete pheromones that control the sex of fish as a way to regulate predation. Removal of the anemone allowed a new female to develop. B. In urban areas, tap water is polluted with contamination from endocrine disruptors such as BPA and PCBs. When she removed some of the tank water for the new tank, she should have replaced it with bottled water. C. Clownfish are protandrous hermaphrodites that respond to social cues. Removal of the dominant female allowed the second-largest fish to transform into a female. D. Clownfish synchronize their mating based on seasonal cues indicated by salinity. When she replaced some of the tank water, the lower salinity caused the fish to change into a female. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about the reproductive modes of fish? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A woman who does not carry the color-blindness allele has children with a man who is color blind. What proportion of their children will be color blind?
A) 1/2 B) 1/4 C) 3/4 D) all E) none