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.

---

Definitions:

Intercostal Spaces

The anatomical spaces between the ribs that contain muscles and nerves.

Vital Signs

Basic physiological measurements used to assess the most critical body functions, including temperature, pulse, respiration, and blood pressure.

Menopause

The time in a woman's life, typically between 45 and 55 years of age, when menstrual periods permanently cease, marking the end of reproductive ability.

Blood Pressure

The force exerted by circulating blood on the walls of the body's arteries, measured in systolic over diastolic pressure.