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WorksheetsMelanin Practice Test
Total questions: 50
Worksheet time: 34mins
What is a genotype?
The physical appearance of an organism
The set of genes in our DNA which is responsible for a particular trait
The study of genes and their functions
A type of genetic mutation
What does it mean if an individual is homozygous recessive for a trait?
They have two different alleles for a trait
They have two dominant alleles for a trait
They have two identical recessive alleles for a trait
They do not carry the gene for that trait
In a Punnett square, what does a capital letter represent?
A recessive allele
A dominant allele
A genotype
A phenotype
Which of the following is an example of a homozygous recessive genotype?
AA
Aa
aa
AB
How many alleles for a typical gene does a person inherit from their parents?
1
2
3
4
In a Punnett square, what does the combination of one dominant allele and one recessive allele result in?
A homozygous dominant genotype
A homozygous recessive genotype
A heterozygous genotype
A mutation
Which of the following is true about recessive traits?
They are always more common in the population than dominant traits
They can only be expressed if the individual has two copies of the recessive allele
They are always less advantageous than dominant traits
They cannot be passed on to offspring
What is the purpose of a Punnett square?
To predict the outcome of genetic crosses
To determine the physical appearance of an organism
To change the genotype of an organism
To identify mutations in genes
If both parents are carriers of a recessive allele (heterozygous), what is the probability that their child will express the recessive trait?
25%
50%
75%
100%
What does the term "phenotype" refer to?
The genetic makeup of an organism
The physical appearance or visible traits of an organism
A type of genetic disorder
The study of heredity and the variation of inherited characteristics
Which of the following genotypes would be considered heterozygous?
AA
Aa
aa
AAA
How can Mendelian inheritance be used to predict the probability of inheriting a particular trait?
By studying the environmental factors affecting the trait
By analyzing the phenotypes of the parents
By using a Punnett square to determine possible genotypes of offspring
By changing the alleles in the DNA of the parents
Which of the following best describes the relationship between genotype and phenotype?
The genotype determines the phenotype
The phenotype determines the genotype
The genotype and phenotype are unrelated
The phenotype can change the genotype
The colored in shape means
Someone that is married into the family
Male
Has the trait being traced
Dead
What is the probability of two heterozygous parents producing an offspring with a homozygous dominant genotype?
25%
50%
75%
100%
Which of the following is a genotype for a child if one parent is homozygous dominant (AA) and the other is homozygous recessive (aa)?
Aa
AA
aa
None of the above
What does a square represent in a pedigree chart?
Female
Male
Carrier of a trait
Individual affected by the trait being traced
________ is how a trait appears, or is expressed. The part we can see.
Dominance
Genotype
Phenotype
Polygenic Inheritance
_______ are the different forms of a gene.
Duplicates
Genes
Pairs
Alleles
A ________ is a section on a chromosome that has genetic information for one trait.
Duplicate
Gene
Pair
Allele
The chromosomes inside you exist as ________, one from each of your parents.
Duplicates
Genes
Pairs
Alleles
Scientists learned that __________ contain genetic information that controls traits.
Chromosomes
Genes
Pairs
Alleles
Scientist have learned that _________ are not the only factors that can affect phenotypes.
People
Genes
Pairs
Alleles
A __________ is a model used to predict possible genotypes and phenotypes of offspring.
Pedigree
Punnett Square
Codominance
Genetic Make-up
a gene whose expression can be hidden
recessive gene
dominant gene
Select all of the following genotypes that are considered Homozygous.
AA
bb
Hh
Dd
zz
Genotype
the genetic makeup of an organism
the physical appearance of an organism
the passage of genetic material from parents to offspring
brown eyes
Heterozygous
having two alleles that are the same
having two alleles that are different
a characteristic of an organism
one of two or more forms that a gene could take
Trait that covers other traits; represented by a capital letter
dominant
recessive
genotype
phenotype
actual alleles; represented by two letters
heterozygous
homozygous
genotype
phenotype
Inheritance
the passage of genetic material from parents to offspring.
the offspring of genetically different parents.
having two alleles that are the same
having two alleles that are different
Deoxyribonucleic acid, a double stranded helical molecule that carries genetic information.
dominant gene
chromosomes
DNA
gene
Genetic makeup of an animal or plant
phenotype
inherited trait
homozygous
genotype
the likelihood of an occurrence
Probability
Punnett Square
gene
heredity
the child or young of two parents
phenotype
species
purebred
offspring
Select all of the following genotypes that are considered Heterozygous.
AA
Bb
zz
Dd
Hh
On a pedigree, this symbol represents a ---
not affected female.
not affected male.
affected male.
affected female.
On a pedigree, this symbol represents a ----
not affected male.
not affected female.
affected male.
affected female.
How many individuals are there in the 3rd generation?
1
2
4
6
How are individuals III-2 and II-4 related?
Brother and sister
Dad and daughter
Uncle and niece
Grandfather and granddaughter
The trait this pedigree traces is recessive because it skips a generation and individuals can be carriers. What is the most likely genotype for person III-3?
GG
Gg
gg
If this pedigree shows a recessive disorder, what MUST the genotype of individual 4 be?
HH
Hh
hh
Generation 2 individuals 5 and 6 are
brother and sister.
cousins.
married.
not related.
Can a couple with brown eyes and blue eyes have a blue eyed child?
Yes, if the brown eyed parent carries a blue eyed trait.
No. The children will all have brown eyes.
Yes, if they shake the test tube.
Yes, if the blue eyed parent has a brown eyed gene.
