AnswersWI-Grade 8 Life Science ADNA Mutations

DNA Mutations Answers

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a positivea negativean aggressivea neutral

A
a positive
B
a negative
C
an aggressive
D
a neutral
2
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Why can't organisms control genetic mutations?

A
because mutations only happen in laboratories
B
because mutations are random, unplanned changes
C
because mutations are usually harmful to organisms
D
because mutations are controlled by organisms' environment
3

colortextureshapeflavor

A
color
B
texture
C
shape
D
flavor
4

Which best shows a harmful effect of a mutation?

A
Option
B
Option
C
Option
D
Option
5

Which best summarizes the effects of mutations on organisms?

A
Mutations are sometimes helpful, sometimes harmful, and sometimes neutral.
B
Mutations are usually harmful, sometimes neutral, and never helpful.
C
Mutations are sometimes neutral, sometimes helpful, and never harmful.
D
Mutations are always harmful, never helpful, and never neutral.
6

Which mutation is beneficial?

A
one that changes the color of a rabbit, allowing it to hide from predators
B
one that results in lighter flower petal colors without changing the plant’s ability to reproduce
C
one that causes a person’s body to produce thick mucus that clogs the lungs
D
one that makes it easier for a corn plant to contract a disease
7

When will a genetic mutation most likely occur in an organism?

A
when a new trait has a neutral effect on the organism
B
when the organism is taking antibiotics
C
when a strand of RNA is copying a strand of DNA
D
when an organism is breaking down amino acids
8

A mutation causes a dog to be born with a tail that is shorter than normal. Which best describes this mutation?

A
It is harmful because it obviously affects the dog’s survival.
B
It is harmful because it affects the dog’s physical appearance.
C
It is neutral because it does not obviously affect the dog’s survival.
D
It is beneficial because it affects the dog’s physical appearance.
9

Hemoglobin is a protein in red blood cells. A mutation can cause a defect in human hemoglobin. Which is most likely caused by this type of mutation?

A
decreased ability to carry oxygen
B
development of cancerous tumors
C
inability to break down sugar
D
development of bacterial infections
10

lactose intolerancecancerlow blood oxygendiabetes

A
lactose intolerance
B
cancer
C
low blood oxygen
D
diabetes
11

cellsribosomesamino acids

A
cells
B
ribosomes
C
amino acids
12

Which characteristic of a protein may change during a DNA mutation?

A
hardness
B
color
C
texture
D
shape
13

Which is most likely caused by a genetic mutation?

A
A kitten is born with blue eyes.
B
A kitten is born with sharp claws.
C
A kitten is born with six toes on one foot.
D
A kitten is born with a short tail that grows longer.
14

Which is the best example of a genetic mutation in plants?

A
a plant's leaves turn green after being watered
B
a plant develops resistance to a new disease
C
a plant grows taller after being potted in a bigger container
D
a plant displays the same flower color as its parents

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