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Unit 5 Genetics Prax Test

Total questions: 60

Worksheet time: 2hrs 47mins

Name
Class
Date
1.

A version of a gene is called a(n)

a)

allele

b)

characteristic

c)

trait

2.

If "T" is the dominant allele for tall and "t" is the recessive allele for short, then what phenotype would "Tt" produce?

a)
tall
b)
short
c)
medium
3.


In the Punnett Square below, which genotype belongs in the missing square?

a)
tt
b)
Tt
c)

TT

4.

In a heterozygous genotype, the ___________ allele is expressed in the phenotype.

a)
recessive
b)
dominant
c)

homozygous

5.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
a)
0 %
b)
25%
c)
50%
6.

What is the probability that the offspring will express the dominant trait?

a)

25%

b)

50%

c)

75%

7.

The alleles "tt" is which genotype?

a)

Homozygous Dominant

b)

Heterozygous

c)

Homozygous Recessive

8.

If a heterozygous tall pea plant is crossed with a short pea plant (recessive), what are the possible genotypes of the future offspring?

a)
100% Tt
b)
50% Tt, 50% tt
c)
75%Tt, 25%tt
9.

If yellow peas are dominant, then a heterozygous yellow pea plant's genotype would be:

a)
YY
b)
yy
c)
Yy
10.

A phenotype is the ___________ of an organism.

a)

Dominance

b)

Physical appearance

c)

Recessiveness

11.
If green is dominant over purple, then what is the genotype for this individual?
a)

Gg

b)
GG
c)
gg
12.
The letters on the TOP AND SIDE of a punnett square represent ______________.
a)
The combination of alleles in offspring.
b)
The possible alleles given by the parents following meiosis.
c)
The genotype and phenotype of offspring.
13.

What is the predicted percentage of homozygous recessive offspring in this cross?

a)

0%

b)

25%

c)

50%

14.
What are the parents' genotypes?
a)
Homozygous for brown eyes
b)
Heterozygous for brown eyes
c)
Homozygous for blue eyes
15.
Tallness is dominant in pea plants and is represented by "T." What would the genotype be for a homozygous tall plant?
a)
Tt
b)
tt
c)
TT
16.
A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?
a)
0%
b)
50%
c)
75%
17.
Who is the father of genetics? 
a)
Charles Darwin 
b)
Gregor Mendel
c)
Dimitri Mendeleev 
18.

What predicts genetic outcomes?

a)

genetic engineering

b)

punnet square

c)

probability

19.
What did Gregor Mendel use to discover the principles that rule heredity?
a)
Pea Plant
b)
Pigeons
c)
Pear trees
20.

Objective #5

(B-brown eyes & b-blue eyes)

Cross (Dad)Bb X (Mom)BB.

List the possible genotypes from this cross.

a)

BB, Bb, bb

b)

BB, Bb

c)

bb,Bb

21.
What goes in box 3
a)
Aabb
b)
AABB
c)
AAbb
22.
What is the genotype for a pea plant heterozygous for round seeds (R), and homozygous recessive for green seeds (y)?
a)
Ry
b)
RRyy
c)
Rryy
23.

Based off this punnett square, what fraction of the offspring will have wrinkled, yellow seeds?

a)

9/16

b)

3/16

c)

1/16

24.

In rabbits, grey hair (G) is dominant to white hair (g). Also, black eyes (B) are dominant to red eyes (b).


Determine the phenotype of a rabbit with the genotype: GGBB

a)

purebred for both traits

b)

purebred grey fur with red eyes

c)

hybrid for both traits

25.

In rabbits, grey hair (G) is dominant to white hair (g). Also, black eyes (B) are dominant to red eyes (b).


Determine the genotype of a rabbit with the phenotype: hybrid for grey fur with purebred for red eyes

a)

Ggbb

b)

GGbb

c)

GGBB

26.
Using the dihybrid cross and key provided, what is the probability of the offspring being tall and white?
a)
9
b)
2
c)
3
27.
In a dihybrid cross
a)
one trait is crossed.
b)
two traits are crossed.
c)
four boxes are needed for the punnett square.
28.

What is the genotype for a pea plant homozygous for round seeds (R), and heterozygous for yellow seeds?

a)

RrYy

b)

RRyy

c)

RRYy

29.

A way to predict genetic probability using two different

sets of alleles on two different chromosomes.

a)

Incomplete Dominance

b)

Monohybrid Cross

c)

Dihybrid Cross

30.

The blending of two traits is known as ---

a)

incomplete dominance

b)

codominance

31.

A condition in which both alleles for a gene are expressed so that both traits are visible is known as ---

a)

Codominance

b)

Incomplete dominance

32.

What type of inheritance pattern is shown here?

a)

Codominance

b)

Incomplete dominance

33.

This is an example of ---

a)

Incomplete dominance

b)

Codominance

34.

This is an example of ---

a)

Incomplete dominance

b)

Codominance

35.

Some flowers are controlled by codominance. Red flowers (RR), blue flowers (BB) and Speckled flowers (RB).


Cross a red flower with a speckled flower. What is the phenotypic ratio?

a)

2 red, 2 speckled

b)

2 red, 2 blue

c)

2 blue, 2 speckled

36.

Some flowers are controlled by codominance. Red flowers (RR), blue flowers (BB) and Speckled flowers (RB).


Cross two speckled flowers.

a)

1 red, 2 speckled, 1 blue

b)

2 red, 2 blue

c)

2 blue, 2 speckled

37.

Codominance occurs in calico cats, which allows for the Black and Tan colors to show. What percentage of the offspring will be calico (black and tan spotted)?

a)

25

b)

50

c)

75

38.

Incomplete dominance occurs in cats, which allows them to be Black, White, or gray as shown on this Punnett square. What percentage of the offspring will be white?

a)

25

b)

50

c)

0

39.

Incomplete dominance occurs in cats, which allows them to be Black, White, or gray as shown on this Punnett square. What percentage of the offspring will be gray?

a)

25

b)

50

c)

100

40.
If a father is AA and a mother is AB, what is the probability for a child with AB blood? 
a)
25%
b)
50%
c)
75%
41.
If two parents have type AB blood, what is the probability that their child will have type O blood?
a)
0%
b)
50%
c)
100%
42.
What types of blood can a person with AB RECEIVE?
a)
B only
b)
AB, A, B, O
c)
AB and O only
43.
What type of blood is the universal donor?
a)
O
b)
AB
44.
If a red blood cell has no antigens on its surface, what is its blood type?
a)
A
b)
B
c)
O
45.

Which of the following codes for blood type O?

a)

IA IA

b)

IA IB

c)

ii

46.

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X R X r ?

a)

male with white eyes

b)

female with red eyes

c)

male with red eyes

47.

What are the genotypes of these flies:


white eyed, male ?

a)

X R X r

b)

Xr X r

c)

X r Y

48.
If a gene is found only on the X chromosome and not the Y chromosome, it is said to be 
a)
sex-linked trait
b)
polygenic trait
c)
codominant trait
49.
Hemophilia is a recessive x-linked disorder.
Which genotype represents a male with hemophilia?
a)
XHXh
b)
XhXh
c)
XhY
50.
What percentage of the female offspring will be a carrier for this recessive disease?
a)
0%
b)
50%
c)
100%
51.
Which of the following genotypes belongs in the red box in the Punnett square?
a)
XBXb
b)
XbY
c)
XBY
52.

Sex Linked Traits are always on the ______

a)
Y chromosome
b)
Z chromosome
c)
X chromosome
53.
Which individual in the first generation is a carrier?
a)
The male
b)
The female
c)
individual 1
54.
How many generations are shown in this pedigree?
a)
1
b)
2
c)
4
55.
In a pedigree, what shape represents a male?
a)
circle
b)
square
c)
diamond
56.
How many girls in this family express this recessive disorder?
a)
4
b)
5
c)
6
57.
Huntington's Disease is a dominant trait.
What is the correct genotype for individual I-2?
a)
HH
b)
Hh
c)
hh
58.
If a trait SKIPS a generation, it is an indication that the trait is....
a)
dominant
b)
recessive
c)
incompletely dominant
59.
How many boys did the mother and father from the first generation have?
a)
2
b)
4
c)
5
60.
This pedigree represents the inheritance of hemophilia in this family. How many of the females have the hemophilia trait?
a)
5
b)
2
c)
3

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