Which of the Following Statements Supports the Proposition That the Presence

question 88

Multiple Choice

Which of the following statements supports the proposition that the presence of an X chromosome appears to be necessary for life?

• A) X-chromosomal genotypes are expressed as consistent phenotypes at a rate of around 85%, while Y-chromosomal genotypes are expressed as consistent phenotypes at a rate of only about 15%.
• B) The X chromosomes are expressed far earlier in the prenatal period than the Y chromosomes.
• C) There are no chromosomal disorders wherein a person has only Y chromosomes.
• D) Most of the lethal chromosomal disorders, including Tay-Sachs disease and cystic fibrosis, are located on the Y chromosome.

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