What is the chromosomal defect that underlies Down syndrome?
a. An XYY genotype in the 23rd pair
b. Just 22 chromosomal pairs
c. An XXX genotype in the 23rd pair
d. A third chromosome in the 21st pair
D
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If genes play an important role in influencing a specific trait, siblings should be more alike in terms of this trait than will be
a. identical twins. c. cousins. b. fraternal twins. d. people who are unrelated to them.
Queen Victoria of England had a son, Leopold, and a great-grandson, Tsarevich Alexei Nikolaevich Romanov of Russia, both of whom had hemophilia. We can conclude that: a. Queen Victoria must have had hemophilia, too
b. Queen Victoria was a carrier for hemophilia. c. Queen Victoria's husband, Prince Albert, must have been a carrier. d. Leopold and Tsarevich Alexei probably developed hemophilia due to a spontaneous mutation, because their female relatives did not have the condition.
After a day of intensive studying for an exam, the following night's sleep would probably contain a. the usual amounts of REM and NREM sleep. b. more REM sleep than usual
c. less REM sleep than usual. d. more NREM sleep than usual.
Explain three types of death education.
What will be an ideal response?