Answers LHS Biology 1DNA Mutations

Chromosomal Changes Answers

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Why is it important to know the difference between science and pseudoscience?

to look intelligent

to make informed decisions

to score well on tests

to tell believable stories

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Which change to the chromosome causes Robertsonian translocation?

part of the chromosome breaks off, causing missing genes on the chromosome

movement of genes on the same chromosome

duplication of genes on the same chromosome

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

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

have routine X-rays taken every week to make sure that your body is healthy

refuse any X-ray procedures, regardless of the reason for needing the X-ray

wear a lead protective shield when having teeth X-rays

no precautions can reduce the risk of chromosome mutations

Which best describes chromosomal deletion?

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

occurs when part of a chromosome breaks off and reattaches backward on the same chromosome

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

occurs when part of a chromosome breaks off and attaches to another chromosome

Gary has a chromosomal deletion and Heather has a chromosomal insertion. Which best describes which disease each may have?

Gary might have DiGeorge syndrome and Heather might have Fragile X syndrome.

Gary might have Kleinfelter’s syndrome and Heather might have Fragile X syndrome.

Gary might have Fragile X syndrome and Heather might have Down syndrome.

Gary might have DiGeorge syndrome and Heather might have Down syndrome.

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

inversion

translocation

deletion

insertion

Chromosomal mutations can have a variety of effects on individuals. Klinefelter syndrome is a genetic disorder that occurs when a male has an extra copy of the X chromosome. Males who have this disorder exhibit characteristics such as producing little or no facial hair, having a less muscular body than other males, and sterility.Karyotype of Klinefelter syndromeWhich type of chromosomal mutation causes Klinefelter syndrome?

nondisjunction

translocation

deletion

insertion

Which best describes the process of insertion?

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

occurs when part of a chromosome breaks off and reattaches backward on the same chromosome

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

occurs when part of a chromosome breaks off and attaches to another chromosome

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

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

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

increased exposure to UV light decreases the immune system function

increased exposure to UV light has no effect on the risk for getting skin cancer

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

deletion of genes within the same chromosome arm

switching of genes within the same chromosome arm

switching of genes around the centromere

deletion of genes around the centromere

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Chromosomal Changes Answers

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