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WorksheetsGenetics Test Review
Total questions: 61
Worksheet time: 52mins
Which term describes the different forms of a gene
Chromosome
Allele
DNA
Punnett Squares
Aa, DD, Bb, yy are all examples of _______
genotypes
phenotypes
If something is homozygous, it can also be called____
phenotype
genotype
hybrid
purebred
You inherit half of your DNA from your mother and half from _______?
Your father
Your pet hamster
Your grandmother
Your sister
A tool used to predict the probability of offspring inheriting certain traits is called a ...
karyotype
Punnett Square
The physical expression of a trait is called the ...
genotype
phenotype
Genotype: TT
homozygous dominant
homozygous recessive
heterozygous dominant
Genotype: Aa
homozygous dominant
homozygous recessive
heterozygous dominant
Cross 2 heterozygous tall pea plants. Tall (T) is dominant to short (t). What fraction of the offspring do you predict will be tall?
1/4
2/4
3/4
4/4
Which statement below describes DOMINANT alleles?
expressed when at least one is present
only expressed when 2 are present
Which of the following is a PHENOTYPE for flower color in pea plants?
Pp
PP
Purple
The trait or allele that is expressed when only one is present is called the ___________ trait.
dominant
recessive
In the problem shown, what must the genotype of the missing parent be?
BB
Bb
bb
In humans, freckles (F) on the skin are dominant to no freckles (f). If a heterozygous parent and a recessive parent conceive, what is the chances of having a child with NO FRECKLES?
0%
50%
100%
Having freckles is a dominant trait in humans. A girl has freckles, but her brother does not. What do we know for certain about the parents?
both parents have at least one recessive allele
both parents are heterozygous for freckles
one of the parents does not have freckles
In a population of bees, long wings (L) are dominant over short wings (l). Bees with long wings are ...
heterozygous only (Ll)
homozygous
dominant only (LL)
heterozygous or
homozygous
dominant (LL or Ll)
Genotype: rr
homozygous dominant
homozygous recessive
heterozygous dominant
Which statement below describes RECESSIVE alleles?
expressed when at least one is present
only expressed when 2 are present
Which set of alleles are considered heterozygous?
HH
Hh
HR
hh
In a pedigree, which shape represents a male?
circle
square
Which gender has an X and a Y chromosome?
male
female
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
What is the mode of inheritance shown here?
Recessive because it "skips" a generation
Dominant because it shows up in every generation
In the second generation of this pedigree, how many people are carriers of the trait? *Remember: a carrier does not have the disorder/disease, but can pass it on to his/her children.
1
2
3
5
On this pedigree, the allele for curly hair is dominant. The couple labeled 2 both have curly hair, but have a daughter who does not have curly hair. Therefore, we can tell from the chart that for the couple labeled 2 -
the male is heterozygous and the female is heterozygous.
the male is homozygous recessive and the female is homozygous dominant.
Why do all the daughters in Generation II carry the colorblind gene?
Because mom passed on the gene.
Because dad passed on the X chromosome.
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 II-3 be?
HH
Hh
hh
The blending of two traits is known as ---
incomplete dominance
codominance
A condition in which both alleles for a gene are expressed so that both traits are visible is known as ---
Codominance
Incomplete dominance
What type of inheritance pattern is shown here?
Codominance
Incomplete dominance
A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?
Incomplete dominance
Codominance
This is an example of ---
Incomplete dominance
Codominance
A red flowered plant (RR) is crossed with a white flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance. What percentage of the offspring will have red (RR) flowers?
0%
25%
50%
100%
Examples include skin color and height (the individual's phenotype exists somewhere along a spectrum)
polygenic inheritance
multiple alleles
linked genes
incomplete dominance
A trait that is located on the X chromosome is called
Multiple alleles
Codominance
Polygenic Inheritance
X-linked traits
For haemophilia, let H be the normal allele and h the mutant allele.
Which is the genotype of the unaffected male?
XhY
XHXH
XHXh
XHY
Which genotype represents a male that has normal vision? (not color blind)
XBXb
XBY
XbY
XBXB
A woman who is colorblind has a mother with normal vision. Knowing that colorblindness is a sex-linked recessive gene, what is her mother’s genotype? What is her father’s genotype? Use XN for normal vision and Xn for colorblindness.
XNXN
XnY
XNXn
XnXn
XNY
The woman who is colorblind marries a man with normal vision. What is the probability that their sons will be colorblind?
0%
25%
50%
100%
Who is more likely to inherit and be affected by sex-linked disorders?
Males
Females
Equal chances
In the image above, what is the percentage of the offspring has the possibility of inheriting blood type O?
0%
25%
50%
100%
Which of the following codes for blood type O?
IA IA
IB i
IA IB
ii
Why are there so many phenotypes for human blood types (what causes there to be more than just 2 phenotypes)?
multiple alleles
incomplete dominance
total dominance
non dominance
Name the proteins on the surface of red blood cells.
Antibodies
Antigens
Plasma
Collagen
What antibodies can be found in the plasma when someone has blood type A?
none
A
B
A and B
