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WorksheetsDNA, Genetics, and Heredity Practice Test
Total questions: 55
Worksheet time: 39mins
EACH parent parent donates how many alleles to an offspring for each trait?
1
2
3
4
What does homozygous mean?
Having two different alleles for a particular gene.
Having two identical alleles for a particular gene.
An organism’s physical appearance, or visible traits.
An allele that is hidden whenever the dominant allele is present.
"Eye Color" as a heading would be a ?
Characteristic
Heterozygous
Phenotype
Homozygous
How many total chromosomes do humans generally have?
46
23
64
2
On a pedigree chart males are represented by ______.
Squares
Circles
In a heterozygous genotype with complete dominance, the ___________ allele takes over in the phenotype.
recessive
dominant
lower case letter
both
Where do the factors for a trait come from?
unrelated organisms
siblings
parent organisms
offspring
The traits that we can see, or the physical appearance.
The passing of physical characteristics from parents to offspring is
Trait
Allele
Heredity
Genetics
In a Punnett square, a lower case letter stands for a ____________ allele.
dominant
recessive
homozygous
heterozygous
Hair color, height, eye color and freckles are examples of human traits. What do we call the physical expression of the genetic material of an organism?
genetics
heredity
genotype
phenotype
Heterozygous is when...
the alleles are the same, example TT
the alleles are different, one recessive and one dominant, example Tt
the alleles are absent, No allele
the alleles are present, but are both recessive, example tt
T = tall and t = short
In the punnett square shown, what belongs in the missing square
tt
Tt
Bb
TT
Which of the following alleles is homozygous recessive?
Tt
tt
TT
t
0%
25%
50%
100%
Which of the following genotypes is homozygous dominant?
A
Aa
AA
aa
Which of the following genotypes is heterozygous?
Bb
BB
bb
B
A recessive allele is represented by a ______ letter.
lower-case
capital
The person who discovered the rule of heredity with his experiments with pea plants.
Nelson Mandela
Gregor Mendel
Isaac Newton
Harold Washington
If you crossed a PP (purple) with a pp (white), what would the phenotypes be (assuming complete dominance)?
all white
all tall
all purple
1/2 white, 1/2 purple
_________________ describes a trait that is covered over, or masked by another form of that trait.
dominant
punnett
recessive
gene
The letters representing the phenotype is called
phenotype
genotype
Different forms of the same gene are called
alleles
traits
A ______________ square is a model that helps make genetic predictions.
Punnett
Mendel
In a pedigree, what do circles represent?
males
females
carrier
non carrier
An allele combination of two lower case letters.
heterozygous
homozygous dominant
homozygous recessive
heterozygous recessive
Dominant alleles are represented by this type of letter.
vowel
capital letter
lower case letter
vowel
The percentage that describes how likely something may occur.
ratio
probability
variable
exponent
Another term for the genes inherited from mother and father.
jeans
genes
DNA
allele
Any change in someone's DNA.
deletion
mutation
manipulation
creation
According to the Punnett Square, what is the percent probability that the parents will have heterozygous children.
100%
50%
25%
0%
A= Long Lashes
a= Short Lashes
According to the Punnett Square, what is the probability that the offspring will have have long lashes?
100%
75%
50%
25%
What does DNA determine?
traits of living things
traits of nonliving things
organization of living things
Did Not Attempt
What are the 3 parts of a nucleotide?
sugar
nucleo
nitrogenous base
phosphate group
Adenine always pairs with...
thymine
cytosine
guanine
adenine
Cytosine always pairs with...
thymine
cytosine
guanine
adenine
Thymine always pairs with...
thymine
cytosine
guanine
adenine
Guanine always pairs with...
thymine
cytosine
guanine
adenine
What is the shape of DNA?
double helix
single helix
squiggle
twisty step looking thing
The passing of physical characteristics, or traits, from parent to offspring.
Genetics
Dominant allele
Heredity
Recessive allele
The scientific study of heredity.
Genetics
Heredity
Probability
Pedigree
An organism that is the offspring of many generations that show the same form of a trait.
Heterozygous
Dominant allele
Purebred
Genotype
A trait that always shows up when the allele is present.
Genotype
Phenotype
allele
Dominant allele
A trait that is always hidden when the dominant allele is present.
Phenotype
Recessive allele
Genotype
Heredity
A chart that shows all the possible ways alleles can combine in a genetic cross.
Pedigree
Family tree
Heterozygous
Punnett square
A chart or a family tree that shows the presence or absence of a trait according to the relationships within a family across several generations.
Punnett square
Pedigree
Heredity
Purebred
An organism that has two identical alleles for a trait.
Twins
Heterozygous
Phenotype
Homozygous
An organism that has two different alleles for a trait.
Homozygous
Heterozygous
Dominant allele
Hybrid
This codominant punett square shows the genotypes of two cows and their fur color. Please select the probability of each phenotype color offspring.
B = black W = white
The probability of an all black offspring is (a)
The probability of an all white offspring is (b)
The probability of a black and white offspring is (c) 5
In this pedigree, some of the family members have hemaphilia. There are (a) female(s) and (b) male(s) with hemaphelia. However, there are (c) family member who carry the trait for hemaphelia.
