Multiple Choice
Tom's brother suffers from phenylketonuria (PKU), a recessive disorder. Tom and the brother's parents do not have PKU. What are the chances that Tom is a carrier of the recessive PKU allele?
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13. Mendelian Genetics
Autosomal Inheritance
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
In which genetic testing procedure would a physician remove a small tissue sample from a membrane of fetal genetic origin?
A
Amniocentesis
B
Fetoscopy
C
Ultrasound
D
None of the listed responses is correct.
E
Chorionic villus sampling
Verified step by step guidance1
Understand the purpose of genetic testing procedures: These are used to diagnose genetic disorders or conditions in a fetus by analyzing genetic material.
Identify the procedure that involves removing a tissue sample: Chorionic villus sampling (CVS) is a procedure where a small sample of tissue is taken from the chorionic villi, which are part of the placenta and share the fetus's genetic makeup.
Differentiate between the listed procedures: Amniocentesis involves sampling amniotic fluid, Fetoscopy is a visual examination of the fetus, and Ultrasound uses sound waves to create images of the fetus.
Recognize the specific nature of CVS: It is performed earlier in pregnancy than amniocentesis and involves sampling tissue from the placenta, which is of fetal origin.
Conclude that the correct procedure for removing a small tissue sample from a membrane of fetal genetic origin is Chorionic villus sampling.
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