The presence of an extra X chromosome is more likely to result in a viable human fetus than an extra copy of an autosome because:
A. expression of genes from the X
chromosome is restricted to early
development of females.
B. the X chromosome carries few genes, so
dosage is not a problem.
C. the X and the Y chromosomes do not
recombine along most of their length.
D. the X chromosome is the "female"
chromosome.
E. None of the above
F. All of the above
E
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a. true b. false
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