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Question 1

Which of these conditions is caused by nondisjunction of autosomal chromosomes?

XO-Turner syndrome

Trisomy 21-Down syndrome

XXY-Kleinfelter syndrome

Trisomy X-Meta female

Question 2

What is the cause of about one-third of all cancer deaths?

Smoking tobacco

Exposure to viruses

Exposure to ultraviolet light

Exposure to high-energy radiation

Question 3

DNA is often likened to an instruction manual. According to this analogy, the typographical errors that would inevitably result when the DNA "manual" is transcribed would be similar to:

dominant alleles.

recessive alleles.

mutant alleles.

homologous chromosomes.

Question 4

Which of the following pairs of people would provide the most useful information to geneticists, regarding the heritability of a certain trait?

non-twin siblings separated into different households soon after birth

monozygotic twins separated into different households soon after birth

non-twin siblings raised in the same household since birth

monozygotic twins raised in the same household since birth

Question 5

DNA is double stranded and similar in structure to a twisted rope latter composed of nitrogenous bases paired with hydrogen bonds in what order?

Adenine and cytosine, thymine and guanine

Adenine and thymine, guanine and cytosine

DNA replication and DNA polymerase

Sister chromatids and centromere

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