For decades many clinical questions relied chiefly on visible chromosome analysis; molecular tests and sequencing absorbed much of this narrower role.
Karyotype-only diagnostician no longer exists as a living trade. Here is what erased it, and which profession took on the work.
1865–1955
Inheritance becomes science
Mendelian inheritance and chromosome research supplied the concepts later clinics would explain.
What else was happening then
1953
DNA structure is proposed
Watson and Crick publish the double-helix model, accelerating molecular genetics.
1956
Human chromosome count is corrected
Researchers establish that humans normally have 46 chromosomes.
1969
First genetic counseling program
Sarah Lawrence College opens a master's program in genetic counseling.
1975
Amniocentesis becomes established
Prenatal chromosome testing creates a need for careful pre- and post-test communication.
Where that work lives now
Helps people understand inherited conditions, testing choices and results, combining genomic science with non-directive, compassionate counseling.
🧬 Genetic Counselor →