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WorksheetsGenetics Pre-test
Total questions: 15
Worksheet time: 8mins
Factors that control traits are called
a. genes.
b. purebreds.
c.recessives.
d. parents.
Scientists call an organism that has two different alleles for a trait a
a. hybrid.
b. trait.
c. purebred.
d. factor.
What does the notation TT mean to geneticists?
a. two dominant alleles
b. two recessive alleles
c. at least one dominant allele
d. one dominant and one recessive allele
What does the notation Tt mean to geneticists?
a. two dominant alleles
b. two recessive alleles
c. at least one recessive allele
d. one dominant allele and one recessive allele
What is probability?
a. the actual results from a series of events
b. the likelihood that a particular event will occur
c. the way the results of one event affect the next event
d. the number of times a coin lands heads up
What does a Punnett square show?
a. all the possible outcomes of a genetic cross
b. only the dominant alleles in a genetic cross
c. only the recessive alleles in a genetic cross
d. all of Mendel’s discoveries about genetic crosses
If a homozygous black guinea pig (BB) is crossed with a homozygous white guinea pig (bb), what is the probability that an offspring will have black fur?
a. 25 percent
b. 50 percent
c. 75 percent
d. 100 percent
An organism’s physical appearance is its
a. genotype.
b. phenotype.
c. codominance.
d. heterozygous.
What is a mutation?
a. any change that is harmful to an organism
b. any change in a gene or chromosome
c. any change that is helpful to an organism
d. any change in the phenotype of a cell
Which term refers to physical characteristics that are studied in genetics?
a. traits
b. offspring
c. generations
d. hybrids
Where does protein synthesis take place?
a. in the ribosomes in the nucleus of the cell
b. on the ribosomes in the cytoplasm of the cell
c. in the chromosomes in the nucleus of the cell
d. on the chromosomes in the cytoplasm of the cell
Which combination of sex chromosomes results in a male human being?
a. XX
b. YY
c. XY
d. either XX or YY
Cloning results in two organisms that are
a. both adult mammals.
b. produced from cuttings.
c. genetically similar.
d. genetically identical.
No two people have the same DNA, except for
a. crime suspects.
b. brothers.
c. fraternal twins
d. identical twins.
Which nitrogen base in RNA is NOT part of DNA?
a. adenine
b. guanine
c. cytosine
d. uracil
