8th Grade Science-Unit 1 Quarterly Review-2016-17 Question Preview (ID: 33002)


Reviews The Genetics Unit. TEACHERS: click here for quick copy question ID numbers.

What does a gene do?
a) Determines your DNA.
b) Gives an organism its specific traits
c) Cause mutations.
d) Finds your missing socks.

What do mutations cause?
a) Temporary change to your DNA
b) Permanent changes to proteins that cause changes in a trait
c) Chromosomes switch places.
d) Siblings that look identical.

What is a genotype?
a) What makes you identical to your parent.
b) Physical Appearance
c) Genetic Make-up
d) Something that makes up DNA.

What is a phenotype?
a) Physical Appearance
b) Genetic Code
c) How organisms reproduce.
d) A type of protein.

What is a heterozygous allele?
a) HH
b) Hh
c) hh
d) Hhh

What is a homozygous allele?
a) TT
b) Tt
c) ttt
d) tTt

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) The recessive allele will be seen, while the dominant allele will be hidden.
c) The dominant trait will only be seen if you have two dominant alleles.
d) Dominant alleles are represented with a lowercase letter, while recessive alleles are represented with a capital letter.

What is a benefit of GMO's?
a) Food has a shorter shelf life.
b) The offspring looks like their parents.
c) Farmers must use more pesticides to eliminate pests eating their crops.
d) The proteins in the plant can resist the effects of pesticides

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 ensures uniformity.
d) It creates competition.

What is beneficial about artificial selection?
a) My puppy is cute.
b) Creates new species
c) It creates a higher number of desired traits among offspring.
d) Organisms live longer.

Sickle Cell Disease is an example of a
a) beneficial mutation
b) harmful mutation
c) both a beneficial and harmful mutation
d) neutral mutation

Crossing two heterozygous tall plants (Tt) will result in offspring of
a) 2 heterozygous tall and 2 homozygous tall plants
b) 2 homozygous tall and 2 homozygous short plants
c) All heterozygous tall
d) 1 homozygous tall, 2 heterozygous tall, and one homozygous short plant

Why is genetic variation beneficial?
a) It only needs one parent for reproduction
b) There are less adaptations needed
c) A species can live where it wants to
d) It increases the chances of survival and reproduction in specific environments

How do the parts of a flower aid in its survival?
a) Decreases the chances of pollination
b) Increases the chances of successful reproduction
c) Decreases the chances of being killed by other animals
d) There is no effect at all in survival.

What is true about asexual reproduction?
a) The genetic variation decreases
b) It needs 2 parents
c) It has a variety of traits.
d) Chances of survival increases.

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.

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) Peppered moths are an example of artificial selection.
c) They are both exactly the same process.
d) Natural selection uses GMO's to change the traits in certain organisms.

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