Question : 51. Which of the following statements regarding Down syndrome TRUE? A. It due : 1176033

 

 

51.

Which of the following statements regarding Down syndrome is TRUE?

A.

It is due to a defect in the sex chromosomes.

B.

If one identical twin has the disorder, the other twin will not have the disorder.

C.

These individuals have brain shrinkage and are at risk for Alzheimer disease as they age.

D.

Individuals with the disorder must be hospitalized throughout much of their lives.

 

 

 

52.

A factor that increases the probability of having a baby with Down syndrome is

A.

increased age of mother or father.

B.

parents’ use of tobacco.

C.

parents’ use of alcohol.

D.

a defective XY chromosome pattern.

 

 

 

53.

The most frequently stated cause for Down syndrome is

A.

a recessive gene.

B.

seasonal fluctuations of hormones.

C.

exposure to X-rays and pesticides.

D.

an accident in chromosome distribution.

 

 

 

54.

The most common chromosomal abnormality that takes place in the autosomes is

A.

Klinefelter’s syndrome.

B.

Down syndrome.

C.

Turner’s syndrome.

D.

Walker syndrome.

 

 

 

55.

Emanuel’s friend, Natalie, has just given birth to a child with Down syndrome. What should he tell her about the future prospects for the child?

A.

After the first three years, the child’s intellectual development will catch up with normal children.

B.

The child’s retardation will be so severe that she must place the child in an institution.

C.

Although the child will be retarded, she can learn useful skills to support herself as an adult.

D.

The child is likely to die of respiratory problems before 10 years of age.

 

 

 

56.

Which of the following statements about persons with Down syndrome is TRUE?

A.

Most are profoundly retarded.

B.

Most have severe health problems and die before age 30.

C.

Most require total care for life.

D.

Most can function to some degree in society.

 

 

 

57.

A couple’s genetic counselor shows them magnified photographs of each parent’s chromosomes arranged on a chart according to size and structure. What is this chart called?

A.

Allele typing

B.

Phenotype

C.

Gamete analysis

D.

Karyotype

 

 

 

58.

Of the following, the family with the LEAST need for genetic counseling is the one who

A.

already had a child with a genetic defect.

B.

has a family history of hereditary illness.

C.

has a general concern about defects.

D.

includes a parent who suffers from conditions suspected to be inherited.

 

 

 

59.

A researcher compares monozygotic and dizygotic twins for their level of similarity on a trait. This researcher is attempting to determine the __________ of the trait activity levels.

A.

teratogenesis

B.

genotype

C.

karyotype

D.

heritability

 

 

 

60.

A statistical estimate of how much contribution heredity makes toward individual differences in a specific trait at a certain time within a given population is referred to as

A.

inheritance.

B.

heritability.

C.

heredity.

D.

genetics.

 

 

 

 

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