The genetic disorder that can NOT be diagnosed by using a chromosomal karyotype is
Correct answer: B. Phenylketonuria (PKU)
- A. Down syndrome (mongolism)
- B. Phenylketonuria (PKU)
- C. Turner's syndrome
- D. Klinefelter's syndrome
Explanation
Phenylketonuria (PKU) is a genetic disorder that results from a mutation in a specific gene responsible for metabolizing the amino acid phenylalanine. This condition is not due to a chromosomal abnormality, so it cannot be diagnosed using a chromosomal karyotype, which is used to detect changes in chromosome number or structure. In contrast, Down syndrome (mongolism), Turner's syndrome, and Klinefelter's syndrome are all disorders that involve abnormalities in chromosome number or structure, making them detectable through karyotyping.
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About Chromosomes
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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