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Mixed Genetics Practice

Total questions: 52

Worksheet time: 1hrs 1mins

Name
Class
Date
1.

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)?

a)

100%

b)

75%

c)

50%

d)

25%

e)

0%

2.

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.

a)

100%

b)

75%

c)

50%

d)

25%

e)

0%

3.

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.

a)

100%

b)

75%

c)

50%

d)

25%

e)

0%

4.

If 2 heterozygous brown-eyed parents had children, what is the chance of any of their children having blue eyes. Show the Punnett Square.

a)

100%

b)

75%

c)

50%

d)

25%

e)

0%

5.

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?

a)

4 : 0

b)

3 : 1

c)

2 : 2

d)

1 : 2 : 1

6.

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?

a)

Gen = 1 : 2 : 1, Phen = 1 : 2 : 1

b)

Gen = 1 : 2 : 1, Phen = 3 : 1

c)

Gen = 3 : 1, Phen = 3 : 1

d)

Gen = 2 : 2, Phen = 2 : 2

7.

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?

a)

Complete Dominance

b)

Incomplete Dominance

c)

Codominance

d)

Multiple Alleles

8.

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?

a)

Gen = 1 : 2 : 1, Phen = 1 : 2 : 1

b)

Gen = 1 : 2 : 1, Phen = 3 : 1

c)

Gen = 2 : 2, Phen = 1 : 2 : 1

d)

Gen = 1 : 2 : 1, Phen = 2 : 2

9.

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?

a)

100%

b)

75%

c)

50%

d)

25%

e)

0%

10.

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?

a)

100%

b)

75%

c)

50%

d)

25%

e)

0%

11.

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?

a)

4 : 0

b)

3 : 1

c)

2 : 2

d)

1 : 2 : 1

12.

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.

a)

4 : 0

b)

3 : 1

c)

2 : 2

d)

1 : 2 : 1

13.

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).

a)

4 : 0

b)

3 : 1

c)

2 :2

d)

1 : 2 : 1

14.

Define Alleles

a)

Molecule which contains the genetic information for an organism.

b)

Different versions of the same gene.

c)

all the chromosomes/DNA that code for an individual’s traits.

d)

Condensed DNA that is visible during cell division.

15.

Define Gene

a)

Condensed DNA that is visible during cell division.

b)

Different versions of the same gene.

c)

A section of DNA that codes for specific proteins/traits.

d)

Molecule which contains the genetic information for an organism.

16.

During what process does independent assortment and segregation of alleles occur?

a)

Mitosis

b)

Meiosis

c)

Fertilization

17.

A genotype describes the physical characteristics of an individual.

a)

True

b)

False

18.

A phenotype describes the genetic make-up of an individual.

a)

True

b)

False

19.

When Mendel crossed true-breeding tall plants (TT) with true-breeding short plants (tt), all of the offspring were tall because...

a)

The allele for tall plants is recessive.

b)

The allele for short plants is dominant.

c)

The allele for tall plants is dominant

20.

What is the relationship between phenotype and genotype?

a)

The phenotype determines the genotype.

b)

The genotype determines the phenotype.

c)

There is no relationship between phenotype and genotype.

21.

What principle states that during gamete formation genes for different traits separate without influencing each other’s inheritance?

a)

Principle of independent assortment.

b)

Principle of recessives alleles

c)

Principle of complete dominance.

d)

Principle of incomplete dominance.

22.

The law of segregation states: Allele pairs separate during gamete formation and randomly unite at fertilization.

a)

True

b)

False

23.

Principle/Law of Segregation is defined as...

a)

Some alleles are dominant over others.

b)

Allele pairs separate during gamete formation and randomly unite at fertilization.

c)

During gamete formation genes for different traits separate without influencing each other’s inheritance

24.

Principle/Law of Dominance is defined as...

a)

Some alleles are dominant over others.

b)

Allele pairs separate during gamete formation and randomly unite at fertilization.

c)

During gamete formation genes for different traits separate without influencing each other’s inheritance

25.

A Punnett square shows all of the following EXCEPT

a)

All possible results of a genetic cross.

b)

The possible genotypes of the offspring.

c)

The alleles in the gametes of each parent.

d)

The actual genotypes of the offspring.

26.

Multiple alleles refer to an inheritance pattern that has more than two alleles that control phenotype.

a)

True

b)

False

27.

Which option below best describes polygenic inheritance?

a)

More than one set of genes contributing to the phenotype

b)

A blending of genes getting an intermediate phenotype

c)

A phenotype that has more than 2 possible alleles for a gene

28.

A white rose and a red rose produce a pink rose, which type of inheritance does this show?

a)

incomplete dominance

b)

codominance

c)

Multiple alleles

d)

Polygenic inheritance

29.

A kitten has spots and stripes. The mother has stripes and the father has spots. Which law of inheritance does this show?

a)

incomplete dominance

b)

codominance

c)

multiple alleles

d)

polygenic inheritance

30.
Brown is dominant to green. What is the probability of these parents having green offspring?
a)
25%
b)
50%
c)
75%
d)
100%
31.
What would go into punnet square 1
a)
BB
b)
Bb
c)
bb
d)
all choices
32.
What is the genotypic ratio here?
a)
TT = 25% : Tt= 50% :  tt=25%
b)
TT = 100%
c)
TT= 75% : tt = 25%
d)
Tt = 100%
33.
This type of inheritance pattern is a MIXTURE of both traits.
a)
incomplete dominance
b)
co-dominance
c)
Mendelian dominance
d)
complete dominance
34.
A breed of chicken shows co-dominance for feather color. One allele codes for black feathers, another codes for white feathers. The feathers of heterozygous chickens of this breed will be....
a)
all black
b)
all white
c)
all gray
d)
speckled black and white
35.

Which of the following are co-dominant traits (3)

a)
b)
c)
d)
e)
36.

Long hair is a dominant trait. Choose the BEST statement.

a)

This guinea pig received two dominant traits. (HH)

b)

This guinea pig cannot have a recessive allele. (h)

c)

This guinea pig could be homozygous dominant (HH) or heterozygous (Hh)

d)

This guinea pig is homozygous recessive (hh)

37.

This little guy has a recessive trait. Choose the best statement.

a)

Both parents gave him an "h". (hh)

b)

He has one "H" and one "h".

c)

He will die without hair.

d)

He is a baby and his hair will grow in a few more days.

38.
What genotype is missing from this Punnett Square?
a)
RrYy
b)
RRYY
c)
rryy
d)
RrYY
39.

The tail length for cats can be long, medium, and short. This must be a

a)

codominant trait.

b)

incomplete dominant trait.

c)

sex linked trait.

40.

A dihybrid trait crosses ___________.

a)

3 traits.

b)

one trait.

c)

2 traits.

41.

T = Tall and t = short; Y = Yellow seeds and y = green seeds


What genotype would produce a tall plant with yellow seeds?

a)

Ttyy

b)

ttYY

c)

TtYy

d)

ttyy

42.

T = Tall; t = short and Y = Yellow seeds; y = green seeds


What is the phenotype for a plant that is Ttyy?

a)

Tall and green seeds

b)

Short and yellow seeds

c)

Tall and yellow seeds

d)

Short and green seeds

43.

T = Tall and t = short; Y = Yellow seeds and y = green seeds


What genotype would produce a tall plant with yellow seeds?

a)

Ttyy

b)

ttYY

c)

TtYy

d)

ttyy

44.

What goes in box 3

a)

Aabb

b)

AABB

c)

AAbb

d)

aaBb

45.
Based off this punnett square, what fraction of the offspring will have wrinkled, yellow seeds?
a)
9/16
b)
3/16
c)
1/16
d)
16/16
46.
A male beetle has the genotype Ttbb. If this beetle mates with a female with genotype TTBb, what is the chance their offspring will have the genotype TtBb?
a)
3/16
b)
4/16
c)
8/16
d)
12/16
47.
Cross Two Homozygous plants
(
RRYY x rryy)
R = round seeds, r  = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds? 
a)
0%
b)
25%
c)
50%
d)
100%
48.
What proportion of the offspring in Figure 11-4 would be expected to have white, smooth hair?
a)
9/16
b)
3/16
c)
4/16
d)
1/16
49.

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

a)

BBEE x bbee

b)

BBEe x BbEe

c)

BbEE x BbEe

d)

BBee x BBEE

50.
In a dihybrid cross
a)
one trait is crossed.
b)
two traits are crossed.
c)
four boxes are needed for the punnett square.
d)
mom's alleles are dominant.
51.
Using the dihybrid cross and key provided, what is the probability of the offspring being tall and white?
a)
9
b)
2
c)
3
d)
6
52.
parent 1: GgBB
parent 2: ggBb
Find the gametes for parent 1.
a)
GB, GB, gB, gB
b)
gB, gb, gB, gb
c)
Gg, BB, GB, GB
d)
gg, Bb, gB, gb