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WorksheetsGenetics Post Test Study Guide
Total questions: 33
Worksheet time: 17mins
Which of the following people did NOT directly help to discover the structure of the DNA molecule?
Francis Bacon
Francis Crick
Rosalind Franklin
James Watson
Cancer is best described as
a type of genetic engineering
the merging of sex cells
abnormal cell division
tissue that stops growing
Which of these is due entirely to inheritance in humans?
reading skill
eye color
endurance
broken bones
One strand of DNA could be as long as 6 feet if it were stretched out lengthwise. One of the factors allowing DNA to fit inside the nucleus of a cell is its ability to —
break apart into separate genes
extend to form very long, thin molecules
coil tightly around associated proteins
denature from the effect of an enzyme
In squash plants, yellow fruit (Y) is dominant to white fruit (y). If two plants heterozygous for yellow fruit are crossed, what are the possible genotypes of the offspring?
Yy only
YY, yy only
Yy, yy only
YY, Yy, yy only
If one of your parents is homozygous blood type A and the other is homozygous type B, which one of the following blood types would you likely be?
A
B
O
AB
Timothy has attached earlobes like his maternal grandfather. His mother and father both have free earlobes, which are dominant. Which statement best explains how Timothy inherited attached earlobes?
He received a recessive allele from each parent.
He received a dominant allele from each parent
He received a recessive allele from his mother and a dominant allele from his father.
He received a dominant allele from his mother and a recessive allele from his father.
The model of DNA used today was proposed by James Watson and Francis Crick in 1953. In this model, what sequence of bases would be complementary to A-G-C-T-A?
A-G-C-T-A
C-G-C-A-T
A-T-C-G-A
T-C-G-A-T
When a symbiotic relationship benefits both organisms, it is an example of
commensalism
mutualism
parasitism
amensalism
. When a symbiotic relationship helps one organism but doesn’t help or harm the other organism, it is an example of
commensalism
mutualism
parasitism
amensalism
Which of the following correctly matches the person with his or her scientific accomplishment?
Rosalind Franklin - promotion of crop rotation on farms in the United States
Francis Crick - argued that scientific knowledge should be based on observation and
experimentation.
George Washington Carver - discovery of the structure of DNA.
Charles Darwin - development of the theory of evolution by natural selection.
What did Gregor Mendel do to study different characteristics in his genetics experiments?
he studied only asexual plants
he studied only tall and short pea plants
he cross-pollinated plants
he cross-pollinated both plants and animals
Factors that control traits are called
genes
purebreds
recessivness
parents
Scientists call an organism that has two different alleles for a trait a
hybrid
trait
purebred
factor
What does the notation TT mean to geneticists?
two dominant alleles
heterozygous alleles
at least one dominant allele
one dominant allele and one recessive allele
What does the notation Tt mean to geneticists?
two dominant alleles
two recessive alleles
homozygous alleles
one dominant allele and one recessive allele
What is probability?
the actual results from a series of events
a number that describes how likely it is that an event will occur
the way the results of one event affect the next event
the number of times a coin lands heads up
What is the probability of producing a tall pea plant from a genetic cross between two hybrid tall pea plants?
one in four
two in four
three in four
four in four
what does a Punnett Square show?
all the possible outcomes of a genetic cross
only the dominant alleles in a genetic cross
only the recessive alleles in a genetic cross
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?
25%
50%
75%
100%
an organisms physical appearance is its
genotype
phenotype
codominance
heterozygous
what happens during meiosis?
two sex cells combine
chromosome pairs separate and are distributed into new sex cells
each sex cell copies itself to form four new chromosomes
chromosome pairs remain together when new sex cells are formed
When sex cells combine to produce offspring, each sex cell will contribute
one fourth the number of chromosomes in body cells
one half the number of chromosomes in body cells
the normal number of chromosomes in body cells
twice the number of chromosomes in body cells
What is a mutation
any change that is harmful to an organism
any change in a gene or chromosome
any change that is helpful to an organism
any change to the phenotype of a cell
A mutation is harmful to an organism if it
changes the DNA of the organism
changes the phenotype of the organisms
reduces the organism's chances for survival and reproduction
makes the organism better avoid predators
Which term refers to physical characteristics that are studied in genetics?
traits
offspring
hybrids
generations
The different forms of a gene are called
alleles
factors
masks
traits
An organisms genotype is its
genetic makeup
feather color
physical appearance
stem height
an organism that has two identical alleles for a trait is
codominant
tall
homozygous
heterozygous
a heterozygous organism has
three different alleles for a trait
two identical alleles for a trait
one allele for a trait
two different alleles for a trait
which of these traits is controlled by a gene with multiple alleles
straight hairline
smile dimples
widow's peak
blood type
Why does height in humans have such a wide variety of phenotypes?
height is controlled by multiple genes
the gene for height has only two alleles
height is controlled by sex-linked genes
height is controlled by a recessive allele
What factors can affect a person's height?
genes only
both genes and environmental factors
a person's blood type
a person's karyotype
