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8th Grade Science-Unit 1 Quarterly Review-2016-17
Test Description: Reviews the genetics unit
Instructions: Answer all questions to get your test result.
1) What does a gene do?
A
Finds your missing socks.
B
Cause mutations.
C
Determines your DNA.
D
Gives an organism its specific traits
2) What do mutations cause?
A
Siblings that look identical.
B
Temporary change to your DNA
C
Chromosomes switch places.
D
Permanent changes to proteins that cause changes in a trait
3) What is a genotype?
A
Physical Appearance
B
Genetic Make-up
C
What makes you identical to your parent.
D
Something that makes up DNA.
4) What is a phenotype?
A
A type of protein.
B
How organisms reproduce.
C
Physical Appearance
D
Genetic Code
5) What is a heterozygous allele?
A
hh
B
HH
C
Hhh
D
Hh
6) What is a homozygous allele?
A
tTt
B
ttt
C
TT
D
Tt
7) What is the difference between a dominant and recessive allele?
A
The dominant allele will be expressed, while the recessive allele will be hidden.
B
Dominant alleles are represented with a lowercase letter, while recessive alleles are represented with a capital letter.
C
The dominant trait will only be seen if you have two dominant alleles.
D
The recessive allele will be seen, while the dominant allele will be hidden.
8) What is a benefit of GMO's?
A
The proteins in the plant can resist the effects of pesticides
B
The offspring looks like their parents.
C
Food has a shorter shelf life.
D
Farmers must use more pesticides to eliminate pests eating their crops.
9) How does genetic variation benefit an organism?
A
It creates unique phenotypes.
B
It increases their chance of reproduction and survival under certain conditions.
C
It creates competition.
D
It ensures uniformity.
10) What is beneficial about artificial selection?
A
Creates new species
B
My puppy is cute.
C
Organisms live longer.
D
It creates a higher number of desired traits among offspring.
11) Sickle Cell Disease is an example of a
A
harmful mutation
B
neutral mutation
C
both a beneficial and harmful mutation
D
beneficial mutation
12) Crossing two heterozygous tall plants (Tt) will result in offspring of
A
1 homozygous tall, 2 heterozygous tall, and one homozygous short plant
B
2 homozygous tall and 2 homozygous short plants
C
2 heterozygous tall and 2 homozygous tall plants
D
All heterozygous tall
13) Why is genetic variation beneficial?
A
A species can live where it wants to
B
It increases the chances of survival and reproduction in specific environments
C
There are less adaptations needed
D
It only needs one parent for reproduction
14) How do the parts of a flower aid in its survival?
A
Decreases the chances of being killed by other animals
B
Increases the chances of successful reproduction
C
There is no effect at all in survival.
D
Decreases the chances of pollination
15) What is true about asexual reproduction?
A
It needs 2 parents
B
The genetic variation decreases
C
It has a variety of traits.
D
Chances of survival increases.
16) How could gene therapy possibly help Ryan Clark with SCD?
A
It would help him to relax when not feeling well with his symptoms.
B
He would become immune to his medications.
C
His disease would have a new treatment as it replaces his mutated genes with healthy genes
D
It wouldn't help him at all because his disease is too severe.
17) Which statement is true about natural selection and artificial selection?
A
Artificial selection is when mankind chooses certain traits in plants and animals and breeds to enhance that trait
B
They are both exactly the same process.
C
Natural selection uses GMO's to change the traits in certain organisms.
D
Peppered moths are an example of artificial selection.
*select an answer for all questions
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