Match each sex-chromosome count with the correct phenotypic sex:
A. male
B. female
1. XXY
2. XYY
3. XXX
4. X-
1. A,
2. A,
3. B,
4. B.
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All of the following statements about sickle-cell anemia are correct except: a. it came to the attention of geneticists when it was observed that most North Americans who suffer from it areof African ancestry
b. it was traced to abnormalities in populations that live in a clearly defined belt across tropical Central Africa. c. it is notable in areas where high rates of deadly form of malaria is common. d. because it is a disease of adaptation, it can never be brought under control or eradicated. e. heterozygous individuals suffer few negative consequences except under stress or low oxygen.
Finding early plant or animal remains at a particular site does not mean that the species was domesticated there
Indicate whether the statement is true or false.
Generations of scientists have debated whether the Neandertals were ancestral to modern Europeans. The current prevailing view, which denies that ancestry, proposes that
A. Neandertals migrated eastward through Siberia and into the Americas until they died out. B. modern humans evolved in Africa and eventually colonized Europe, displacing the Neandertals there. C. Neandertals died out because they retained too many australopith characteristics that were poorly adapted to northern latitudes. D. H. erectus split into separate groups, one ancestral to the Neandertals, the other ancestral to anatomically modern humans, who first reached Europe around 100,000 B.P.-long before Neandertals. E. H. erectus killed off the Neandertals even prior to the emergence of anatomically modern humans.
Inbreeding is a form of random mating
Indicate whether the statement is true or false