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