Pretest

Question 1

Which best describes chromosomal deletion?

Revolt · Accepted Answer

occurs when part of a chromosome breaks off and does not reattach

Question 2

Which change to the chromosome causes Robertsonian translocation?

Revolt · Accepted Answer

arms of the chromosome are unproportioned, with extra or missing genetic material

Question 3

Which chromosomal defect is caused when part of a chromosome breaks off and reattaches backward on the same chromosome?

Revolt · Accepted Answer

inversion

Question 4

A chromosome has an inversion. Which describes a pericentric inversion?

Revolt · Accepted Answer

switching of genes around the centromere

Question 5

Which of these precautions should be taken to reduce the risk of chromosome mutations?

Revolt · Accepted Answer

wear a lead protective shield when having teeth X-rays

Question 6

Which agent would cause the least damage to a chromosome?

Revolt · Accepted Answer

ultrasound

Question 7

If nondisjunction occurs and an individual survives, which disorder can occur?

Revolt · Accepted Answer

Klinefelter syndrome

Question 8

Which best describes the process of insertion?

Revolt · Accepted Answer

occurs when part of a chromosome breaks off and is placed into the middle of another chromosome

Question 9

Which term describes a permanent change to a genetic sequence?

Revolt · Accepted Answer

mutation

Question 10

Why does prolonged exposure to UV light from the Sun or tanning beds increase the risk for getting skin cancer?

Revolt · Accepted Answer

increased exposure to UV light increases the risk of a mutation occurring

Pretest Answers