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U5L2E3: Traits and Probability

Total questions: 50

Worksheet time: 3600secs

Name
Class
Date
1.

If Huntington's disease is a dominant disorder, which of the following individuals would not have Huntington's Disease?

a)

HH

b)

Hh

c)

hh

d)

all would have the disorder

2.

What is the predicted genotypic ratio of a cross between a two individuals that are heterozygous (Bb)?

a)

3:1

b)

1:2:1

c)

4:0

d)

9:3:3:1

3.

What is the phenotype ratio of the cross seen in the image?

a)

3:1

b)

1:2:1

c)

9:3:3:1

d)

Yy

4.

A-Tall

a-short


What is the chances of growing a tall plant?

a)

1/4

b)

2/4

c)

3/4

d)

100%

5.

Gregor Mendel has a "pure" Generation of homozygous pea plants. What could be the Genotypes of the Parents

a)

bb x BB

b)

bb x Bb

c)

Bb x Bb

d)

BB x Bb

6.

According to the Punnett Square in the image, what is the probability of producing an offspring that is yellow and round?

a)

1/16

b)

3/16

c)

9/16

d)

1/4

7.
An allele that is expressed only when there are two present is called 
a)
a testcross.
b)
the law of independent assortment.
c)
a monohybrid cross.
d)
recessive.
8.
The study of biological inheritance patterns and variation in organisms is
a)
generous.
b)
generic.
c)
general ed.
d)
genetics.
9.
A______________________is a characteristic that is inherited such as eye color.
a)
train
b)
gene
c)
trait
d)
allele
10.
The law of segregation has two main parts:
Organism inherit 2 copies of each gene, one from each parent, AND
a)
the law of the land.
b)
the law of the jungle.
c)
the law of probability?
d)
Only one copy of a gene goes into an organism's gametes.
11.
A ________________ is when a homozygous recessive organism is crossed with an unknown genotype.
a)
testcross
b)
purebred
c)
cross
d)
gene
12.
Monohybrid crosses are crosses that examine
a)
the inheritance of multiple traits.
b)
only two traits.
c)
no traits.
d)
only one specific trait.
13.
The likelihood, or chance, that a particular event will happen is
a)
probability.
b)
untrue.
c)
independent.
d)
true.
14.
Dihybrid crosses are crosses that
a)
examine the inheritance of two different traits.
b)
examine a specific trait.
c)
examine several hundred traits.
d)
examine nothing.
15.
When two alleles of a gene are the same, they are 
a)
heterozygous.
b)
gametogenesis.
c)
homozygous.
d)
polar bodies.
16.
When two alleles of a gene are the different, they are 
a)
heterozygous
b)
purebred.
c)
homozygous.
d)
traits.
17.
Any of the different forms of a gene is called an
a)
gene.
b)
purebred.
c)
allele.
d)
cross.
18.
The inheritance of traits follows
a)
the law of segregation or Jim Crow laws.
b)
the law of independence.
c)
the rules of probability.
d)
lines that act as points of reference.
19.

A _______ is the combination of genes you have for a trait.

a)

phenotype

b)

genotype

c)

cross

d)

gene

20.
In genetics, the mating of two organisms is called
a)
dating.
b)
a lie.
c)
a wonderful life.
d)
a cross.
21.
A gene is
a)
different forms of genes.
b)
a type of pants.
c)
what an organism looks like.
d)
a piece of DNA that stores instructions for making proteins.
22.
What the resulting trait looks like is its 
a)
genotype.
b)
phenotype.
c)
recessessive.
d)
dominant.
23.
A Punnett square is 
a)
expressed when two different alleles are present.
b)
an allele only.
c)
a grid system for predicting genotypes from a cross
d)
not an allele.
24.

Purebred is when

a)

an animal has papers to show its breeding

b)

a person has papers to show their breeding

c)

nothing happens.

d)

the offspring inherits homozygous genes.

25.

When an organism has two alleles at a particular locus that are different, the organism is called

a)

purebred

b)

dominant

c)

heterozygous

d)

recessive

26.

If a pea plant were homozygous recessive for height, how would it's genotype be represented?

a)

Tt

b)

TT

c)

tt

d)

tT

27.

The passing of traits from parents to offspring is known as....

a)

hierarchy

b)

heredity

c)

traits

d)

genetics

28.

Different alleles are...

a)

slight differences in the DNA of a gene

b)

slight different shapes of a certain protein

c)

determined by which parent has the strongest genes

d)

created when a sperm fertilizes an egg

29.
In cacti, long arms (A) are dominant to short arms (a).  Suppose 2 heterozygous cacti are crossed.  What percentage of their offspring are expected to have short arms?
a)
0%
b)
25%
c)
75%
d)
100%
30.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
31.
What are the possible genotypes for this cross?
a)
TT = 25% Tt= 50% tt=25%
b)
all tall
c)
TT= 75% tt = 25%
d)
Tt = 100%
32.

In garden pea plant, long stem is dominant over short stem. How many percent will be short stem garden pea plants that may appear in the first filial generation if both parents are heterozygous for the given trait?

a)

25% short stem pea plant

b)

50% short stem pea plant

c)

75% short stem pea plant

d)

100% short stem pea plant

33.

The results from a Punnett square can be used to find the ______________ that a certain allele combination will occur in offspring.

a)

Probability

b)

Pedigree

c)

Traits

d)

Genes

34.

What would the ratio for genotypes be based on this Punnett Square?

a)

2Bb:2bb

b)

2BB:2Bb

c)

1BB:2Bb:1bb

d)

4Bb

35.

Which is a true statement about this picture?

a)

Brown is recessive

b)

Brown is dominant

c)

Blue is dominant

d)

Blue is codominant

36.

If a homozygous black cat (BB) is crossed with a homozygous white cat (bb), what is the probability of having a cat with white fur?

a)

100%

b)

0%

c)

75%

d)

25%

37.

In plants, tall (T) is dominant to short (t).


Draw a Punnett square and perform the following cross: Tt x Tt


What is the probability of producing a short plant?

a)

0%

b)

25%

c)

50%

d)

75%

38.

Which allele combination should go in the missing box?

a)

AA

b)

Aa

c)

aa

d)

none of these

39.

A homozygous brown mouse is crossed with a heterozygous brown mouse (tan is the recessive color).


Perform a Punnett square cross and determine the phenotype & %.

a)

100% tan

b)

100% brown

c)

50% brown and 50% tan

d)

75% brown and 25% tan

40.

After observing dihybrid crosses, Mendel concluded that the presence of one trait didn't affect the presence of another. This is called

a)

The Law of Inheritance

b)

The Law of Segregation

c)

The Law of Natural Descent

d)

The Law of Independent Assortment

41.
What genotype is missing from this Punnett Square?
a)
RrYy
b)
RRYY
c)
rryy
d)
RrYY
42.

Eggs or sperm will carry _____ copy/copies of each gene.

a)

One

b)

Two

c)

23

d)

46

43.
What is the phenotype of the offspring? (A-Brown hair; a-blond hair) 
a)
50 % Brown Hair and 50% Blond Hair 
b)
25 % Brown Hair and 75% Blond Hair 
c)
75 % Brown Hair and 25% Blond Hair 
d)
0% Brown Hair and 100% Blond Hair 
44.
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)
25%
c)
50%
d)
75%
45.
In pea plants, the tall allele is dominant to the short allele. What key would demonstrate this?
a)
Tall = T
Short = S
b)
Tall = T
Short = t
c)
Tall = t
Short = T
d)
Tall = TT
Short = tt
46.
What is the probability of a purple-horned unicorn if a heterozygous pink-horned unicorn is crossed with a heterozygous pink-horned unicorn?
a)
0%
b)
25%
c)
50%
d)
75%
47.
Leonardo bet his friend Olivet that two heterozygous green-eyed sea monsters could not have a recessive blue-eyed baby sea monster. Olivet said they can have a blue-eyed sea monster.
Who wins the bet?
a)
Leonardo
b)
Olivet
c)
Both
d)
Neither
48.

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?

a)

They have same phenotype and genotype

b)

They have different phenotypes and genotypes

c)

They have same phenotype, but different genotypes

d)

They have different phenotypes, but the same genotype

49.

The genotype Aa is called . . .

a)

Homozygous recessive

b)

Hybrid

c)

Purebred

d)

Homozygous dominant

50.

In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any white-flowering plant resulting from this species?

a)

rr

b)

rR

c)

RR

d)

Rr

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