Which statement describes a key finding of the Human Genome Project?

Correct Answer: B

Rationale: The majority of the 0.1% genetic variations are found within and not among populations. Most human genes produce at least three proteins. The project's research has been very valuable in the identification of genes involved in disease and in the development of genetic testing. There are 20,500 genes in the human genome; scientists originally estimated more than 50,000 genes. Human genes are more efficient than the genes in other species, thereby increasing the human genetic complexity.

Correct Answer: B

Rationale: Aneuploidy is an abnormality of number that is also the leading genetic cause of mental retardation. Chromosomal abnormalities occur in fewer than 1% of newborns. Down syndrome is the most common form of a trisomal abnormality, an abnormality of chromosome number (47 chromosomes). Unbalanced translocation is an abnormality of chromosomal structure that often has serious clinical effects.

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: A

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.