Describe how amniocentesis is used in the prenatal diagnosis of human genetic abnormalities. Then compare and
contrast the benefits and risks associated with amniocentesis and chorionic villus sampling. What will be an ideal response?
Concepts to Consider: Amniocentesis involves collecting a sample of fetal cells from the
amniotic fluid that surrounds the fetus. The karyotype of these cells can then be examined for
chromosomal defects. Chorionic villus sampling can be used effectively earlier in pregnancy
than amniocentesis; however, it is associated with a slightly greater risk of miscarriage. Also,
since the conditions diagnosed using these procedures are incurable, there may be both
psychological and physical benefits to having the information available earlier in the
pregnancy if abortion is going to be considered.
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Assuming complete dominance, what is the expected ratio of genotypes of the offspring following the cross of two heterozygotes?
A. 1:1 B. 4:1 C. 1:2:1 D. 3:1
A female bowerbird being unable to recognize
the mating ritual of a male toucan is an example of what type of isolating mechanism?
a. genetic b. ecological c. behavioral d. mechanical e. temporal
Carotenoids are composed of isoprene subunits
________________Indicate whether the statement is true or false.
What happens when hydrochloric acid (HCl) dissociates in pure water?
A) The water has a decrease of H+ ions. B) The concentration of OH- ions increases. C) The HCl molecules float on top of the water. D) The pH of the solution increases. E) The HCl molecules separate into H+ and Cl- ions.