Which of the following is an example of a single-gene disorder that is dominant?

A) Down syndrome
B) nearsightedness
C) fragile X syndrome
D) Huntington's disease

Question

Which of the following is an example of a single-gene disorder that is dominant?A)  Down syndromeB)  nearsightednessC)  fragile X syndromeD)  Huntington's disease

pratik chorghe · Accepted Answer

Final Answer : D, Explanation :  Huntington's disease is caused by a dominant allele on chromosome 4. The presence of one copy of the allele is enough to cause the disorder to manifest, making it a single-gene dominant disorder. Down syndrome is a chromosomal disorder caused by an extra copy of chromosome 21, nearsightedness is a complex trait influenced by multiple genes and environmental factors, and fragile X syndrome is caused by a mutation in the FMR1 gene on the X chromosome, which is a single-gene disorder but is inherited in an X-linked recessive pattern.

Which of the following is an example of a single-gene disorder that is dominant?

A) Down syndrome
B) nearsightedness
C) fragile X syndrome
D) Huntington's disease

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