CH 8

Which couple would the nurse least likely refer to genetic counseling? A. A 28-year-old woman and 35-year-old man who have traveled extensively worldwide B. A 38-year-old woman and a 42-year-old man C. A 22-year-old woman and a 22-year-old man; the woman reports that her sister has a child with a "bad heart" and experienced one miscarriage. D. A 32-year-old woman and a 45-year-old man who works for a pest control company

A. A 28-year-old woman and 35-year-old man who have traveled extensively worldwide

The majority of genetic disorders are inherited as recessive traits. Which best describes these recessive inheritance? A. Two genes for the disease must be present in an offspring for the disease to occur. B. There is a 50% possibility that a child born to two carriers will have the disease. C. Only one parent must carry the trait for the disease to occur. D. Most recessive disorders are not evident at birth (are recessed).

A. Two genes for the disease must be present in an offspring for the disease to occur.

______are threadlike structures of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes.)

CHROMOSOMES

_____ is the study of chromosomes by light microscopy

CYTOGENETICS

A woman with a history of fetal loss due to genetic disorders is seeking information concerning the use of amniocentesis and chorionic villi sampling (CVS) during her next pregnancy. The nurse understands which to best advise? A. There are no differences in the risk of miscarriage between these tests. B. The loss of pregnancy is reduced in the CVS test because it is done earlier in the gestational period. C. The amniocentesis can safely be done anytime after the 8th week of pregnancy. D. The CVS has a higher risk of both miscarriage and fetal damage.

D. The CVS has a higher risk of both miscarriage and fetal damage.

______ is the study of surface markings of the skin

DERMATOGLYPHICS

T OR F A person who has two like genes for a trait is said to be heterozygous for that trait.

FALSE

T OR F Fragile X syndrome is the most common cause of cognitive challenge in females

FALSE

_____ refers to a person's actual gene composition

GENOTYPE

A(n) _____ is a person's outward appearance or the expression of genes

PHENTOYPE

T OR F Classical karyotyping may be done using a sample of peripheral venous blood or a buccal membrane scraping

TRUE

T OR F Most X-linked inherited disorders are recessive

TRUE

T OR F Parental reactions to the knowledge their child has a possible genetic disorder usually involves a grief reaction

TRUE