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The notion that sex could be determined by chromosomes was a new idea. Prior to Henking, McClung, and Sutton's reports, sex determination was attributed to factors other than gametes, such as the environment in which egg cells existed.
In humans, the __________ determines the sex of the offspring because __________. A gene that is located on a sex chromosome (X or Y chromosome) is __________. Human males are much more likely than human females to have the recessive condition hemophilia (a failure of the blood to clot properly). This is the case because __________.