Question

what is a karyotype? a tool used by geneticists to diagnose genetic disorders. a laboratory technique for altering dna sequences. a form of genetic counseling for couples planning to have children. a treatment for chromosomal abnormalities.

Explanation:

A karyotype is an organized profile of an individual's chromosomes. Geneticists use karyotyping (the process to create a karyotype) to examine chromosomes and diagnose genetic disorders caused by chromosomal abnormalities (like aneuploidy). The second option is incorrect as altering DNA sequences is not what a karyotype does (techniques like CRISPR do that). The third option is wrong because karyotype is not counseling but a diagnostic tool. The fourth option is incorrect as a karyotype is a diagnostic tool, not a treatment (treatments for chromosomal abnormalities are different and rare, often supportive).

Answer:

A. A tool used by geneticists to diagnose genetic disorders.