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WorksheetsGenetics Practice Test
Total questions: 73
Worksheet time: 2hrs 36mins
Define Alleles
Molecule which contains the genetic information for an organism.
Different versions of the same gene.
all the chromosomes/DNA that code for an individual’s traits.
Condensed DNA that is visible during cell division.
Define Gene
Condensed DNA that is visible during cell division.
Different versions of the same gene.
A section of DNA that codes for specific proteins/traits.
Molecule which contains the genetic information for an organism.
Define Chromosome
Condensed DNA that is visible during cell division.
Different versions of the same gene.
all the chromosomes/DNA that code for an individual’s traits.
1. A section of DNA that codes for specific proteins/traits.
A genotype describes the physical characteristics of an individual.
True
False
A phenotype describes the genetic make-up of an individual.
True
False
When Mendel crossed true-breeding tall plants (TT) with true-breeding short plants (tt), all of the offspring were tall because...
The allele for tall plants is recessive.
The allele for short plants is dominant.
The allele for tall plants is dominant
What is the relationship between phenotype and genotype?
The phenotype determines the genotype.
The genotype determines the phenotype.
There is no relationship between phenotype and genotype.
What principle states that during gamete formation genes for different traits separate without influencing each other’s inheritance?
Principle of independent assortment.
Principle of recessives alleles
Principle of complete dominance.
Principle of incomplete dominance.
The law of segregation states: Allele pairs separate during gamete formation and randomly unite at fertilization.
True
False
Tt is an example of...
Homozygous Dominant
Heterozygous
Homozygous Recessive
Principle/Law of Segregation is defined as...
Some alleles are dominant over others.
Allele pairs separate during gamete formation and randomly unite at fertilization.
During gamete formation genes for different traits separate without influencing each other’s inheritance
Principle/Law of Independent is defined as...
Some alleles are dominant over others.
Allele pairs separate during gamete formation and randomly unite at fertilization.
During gamete formation genes for different traits separate without influencing each other’s inheritance
Principle/Law of Dominance is defined as...
Some alleles are dominant over others.
Allele pairs separate during gamete formation and randomly unite at fertilization.
During gamete formation genes for different traits separate without influencing each other’s inheritance
A Punnett square shows all of the following EXCEPT
All possible results of a genetic cross.
The possible genotypes of the offspring.
The alleles in the gametes of each parent.
The actual genotypes of the offspring.
Multiple alleles refer to an inheritance pattern that has more than two alleles that control phenotype.
True
False
Which option below best describes polygenic inheritance?
More than one set of genes contributing to the phenotype
A blending of genes getting an intermediate phenotype
A phenotype that has more than 2 possible alleles for a gene
A white rose and a red rose produce a pink rose, which type of inheritance does this show?
incomplete dominance
codominance
Multiple alleles
Polygenic inheritance
A kitten has spots and stripes. The mother has stripes and the father has spots. Which law of inheritance does this show?
incomplete dominance
codominance
multiple alleles
polygenic inheritance
An example of a genotype is
Tt
Tall
Wrinkled
50%
A genotype is the
actual genes present.
the physical expression of the genes. (physical appearance for example)
Choose the example of the homozygous genotype
Tt
YyRr
RR
Dd
An example of a heterozygous genotype is
Tt
DD
aa
TTRR
A _______________ crosses one trait.
dihybrid cross
trihybrid cross
monohybrid cross
A dihybrid trait crosses ___________.
3 traits.
one trait.
2 traits.
T = Tall; t = short
If you cross a homozygous tall plant with a homozygous short plant, what will the offsprings' phenotype be?
Tall and short
All Tall
All Short
T = Tall; t = short and Y = Yellow seeds; y = green seeds
What is the phenotype for a plant that is Ttyy?
Tall and green seeds
Short and yellow seeds
Tall and yellow seeds
Short and green seeds
What special type of inheritance involves both alleles being dominant for a trait, and both being shown equally?
incomplete dominance
codominance
polygenic inheritance
Neither allele is completely dominant over the other in ____________________. This special inheritance causes heterozygous individuals to have a blended phenotype (red and white alleles causing pink flowers for example).
codominance
multiple allele traits
incomplete dominance
Punnett Squares reflect the _______________ of offspring genotypes resulting from a cross between parents.
probability
certainty
genetics
DNA
In the punnett square below, what belongs in the missing square
Dad: Homozygous recessive
Mom: Heterozygous
How many potential offspring have wet earwax ? ___/4
B = brown eyes
b = blue eyes
One brother has genotype BB and the other brother has genotype Bb.
Which statement is true about these two brothers?
They have same phenotype and genotype
They have different phenotypes and genotypes
They have same phenotype, but different genotypes
They have different phenotypes, but the same genotype
In pigs, having a curly tail (T) is dominant over having a straight tail (t).
Parent 1: Heterozygous
Parent 2: Heterozygous
What are the genotypes of the offspring from the Punnett square?
Tt, Tt
TT, Tt. tt
1 TT, 2 Tt, 1 tt
3 curly, 1 straight
In humans, C genes only give you curly hair. S genes only give you straight hair. If you are a heterozygote then you have wavy hair.
Parent 1: Curly Hair
Parent 2: Straight Hair
What are the phenotypes of the offspring from the square?
curly and straight
1 curly, 2 wavy, 1 straight
4 wavy
2 curly, 2 straight
In humans, blood types exhibit both dominance, codominance, and multiple alleles. The following genotypes are listed for each blood type.
AA or AO= Type A
OO= Type O
BB or BO= Type B
AB= Type AB
_______________________________________________
Parent 1: Homozygous for Type A Blood
Parent 2: Type O Blood
What is the probability of getting type A?
0%
25%
50%
100%
Cross a black fowl with a white fowl. What is the phenotype ratio?
What is the genotype ratio for a cross between a grey fowl and a white fowl?
Complete a cross between 2 speckled flowers and find the genotype ratio.
A father has type AB blood and the mother has type O. What percentage of their offspring would you expect to have?
Type A, 25%, Type B 25%, Type AB 25%, Type O 25%
Type A 50%, Type B 25%, Type AB 25%, Type O 50%
Type A blood 50%, Type B 50%, Type AB 0%, Type O Blood 0%
Type A blood 100%
A father is heterozygous for his type A blood and a mother is heterozygous for her type B blood. What percentage of their offspring would you expect to have?
50% all blood types
25% Type A, 50% Type B, 25% Type O
50% Type A, 50% Type B
Type A 25%, Type B 25%, Type AB 25%, Type O 25%
What type of inheritance is determined by multiple genes and there can be a range of traits?
Codominance
Incomplete dominance
Polygenic traits
A single gene has 3 or more alleles. These are called
multiple genes
multiple alleles
codominance
polygenic traits
Examples include skin color and height (the individual's phenotype exists somewhere along a spectrum)
polygenic inheritance
multiple alleles
linked genes
incomplete dominance
Objective #13
This is a pedigree that follows blue eyes which is a recessive trait. What is the phenotype of the mother (circle) in generation 1?
Brown
Blue
1 blue, 1 brown
Objective #13
On a pedigree how do we know if they have the trait?
Not shaded
Shaded
