Which Statement Supports the Proposition That the Presence of an X

question 68

Multiple Choice

Which statement 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:

Settlement Houses

community-based organizations, historically established in inner urban areas, to provide various services to immigrants and the poor.

Interventions

Specific actions, treatments, or programs aimed at addressing problems or improving conditions for individuals, groups, or communities.

Evaluate

The process of assessing or examining something or someone critically to determine its value, significance, or condition.

Systematic Monitor

A methodical process or device used to observe, check, and record the operation or condition of something.