WorksheetsMixed Genetics Practice
Total questions: 52
Worksheet time: 1hrs 1mins
In hamsters, dark brown fur (CB) is codominant with white fur (CW). Show a cross between a dark brown hamster and a white hamster. What percentage of the F1 generation would be spotted (CBCW)?
100%
75%
50%
25%
0%
In humans, brown eyes are dominant to blue. If a blue-eyed woman had children with a purebred brown-eyed man, what is the chance of any of their children having blue eyes.
100%
75%
50%
25%
0%
If a blue-eyed woman had children with a heterozygous brown-eyed man, what is the chance of any of their children having blue eyes.
100%
75%
50%
25%
0%
If 2 heterozygous brown-eyed parents had children, what is the chance of any of their children having blue eyes. Show the Punnett Square.
100%
75%
50%
25%
0%
In radishes, the gene that controls color exhibits INCOMPLETE dominance. Pure-breeding red radishes crossed with pure-breeding white radishes make purple radishes. What are the phenotypic ratios when you cross a purple radish with a white radish?
4 : 0
3 : 1
2 : 2
1 : 2 : 1
In purple people-eaters, one-horn is dominant and no horns is recessive. Cross two purple people-eaters that are heterozygous for horns. What are the genotypic & phenotypic ratios?
Gen = 1 : 2 : 1, Phen = 1 : 2 : 1
Gen = 1 : 2 : 1, Phen = 3 : 1
Gen = 3 : 1, Phen = 3 : 1
Gen = 2 : 2, Phen = 2 : 2
Crosses between a yellow rat and a yellow rat ALWAYS produce yellow rats. Crosses between a white rat and a white rat ALWAYS produce white rats. But crosses of a white with a yellow produce a cream rat. What type of inheritance patter is this?
Complete Dominance
Incomplete Dominance
Codominance
Multiple Alleles
Crosses between a yellow rat and a yellow rat ALWAYS produce yellow rats. Crosses between a white rat and a white rat ALWAYS produce white rats. But crosses of a white with a yellow produce a cream rat. What are the genotype and phenotype ratios if you cross two cream rats?
Gen = 1 : 2 : 1, Phen = 1 : 2 : 1
Gen = 1 : 2 : 1, Phen = 3 : 1
Gen = 2 : 2, Phen = 1 : 2 : 1
Gen = 1 : 2 : 1, Phen = 2 : 2
In humans, the allele for albinism (lack of pigment) is recessive to the allele for normal skin pigmentation. If two hybrid parents have children what is the chance that a child will be albino?
100%
75%
50%
25%
0%
In the P generation, a purebred yellow pea plant (dominant) is crossed with a purebred green pea plant (recessive). The F1 generation is allowed to self-pollinate. What is the probability of having yellow pea plants in the F2 generation?
100%
75%
50%
25%
0%
In cows, red fur (CR) is codominant with white fur (CW). Show a cross between a red cow and a roan cow (CRCW). What would the phenotypic ratio be?
4 : 0
3 : 1
2 : 2
1 : 2 : 1
In pea plants, round peas are dominant over wrinkled peas. Use a Punnett square to predict the genotypic ratio of a cross between a heterozygous pea plant and a wrinkled pea plant.
4 : 0
3 : 1
2 : 2
1 : 2 : 1
In pea plants, yellow peas are dominant over green peas. Use a Punnett square to predict the genotypic ratio of a cross between two plants that are heterozygous/hybrid for yellow peas (Yy).
4 : 0
3 : 1
2 :2
1 : 2 : 1
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.
During what process does independent assortment and segregation of alleles occur?
Mitosis
Meiosis
Fertilization
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
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 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
Which of the following are co-dominant traits (3)
Long hair is a dominant trait. Choose the BEST statement.
This guinea pig received two dominant traits. (HH)
This guinea pig cannot have a recessive allele. (h)
This guinea pig could be homozygous dominant (HH) or heterozygous (Hh)
This guinea pig is homozygous recessive (hh)
This little guy has a recessive trait. Choose the best statement.
Both parents gave him an "h". (hh)
He has one "H" and one "h".
He will die without hair.
He is a baby and his hair will grow in a few more days.
The tail length for cats can be long, medium, and short. This must be a
codominant trait.
incomplete dominant trait.
sex linked trait.
A dihybrid trait crosses ___________.
3 traits.
one trait.
2 traits.
T = Tall and t = short; Y = Yellow seeds and y = green seeds
What genotype would produce a tall plant with yellow seeds?
Ttyy
ttYY
TtYy
ttyy
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
T = Tall and t = short; Y = Yellow seeds and y = green seeds
What genotype would produce a tall plant with yellow seeds?
Ttyy
ttYY
TtYy
ttyy
What goes in box 3
Aabb
AABB
AAbb
aaBb
(RRYY x rryy)
R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds?
A white mouse with red eyes is crossed with a black mouse with brown eyes. The white mouse is recessive for both of its traits. The black mouse is dominant for both of its traits.
This cross would be
BBEE x bbee
BBEe x BbEe
BbEE x BbEe
BBee x BBEE
parent 2: ggBb
Find the gametes for parent 1.
