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Genetics/Heredity Test Review

Total questions: 54

Worksheet time: 2hrs 48mins

Name
Class
Date
1.

How many alleles do you inherit from EACH parent for a specific trait?

a)

1

b)

2

2.

Genotype: TT

a)

homozygous dominant

b)

homozygous recessive

c)

heterozygous dominant

3.

Genotype: Aa

a)

homozygous dominant

b)

homozygous recessive

c)

heterozygous dominant

4.

Cross 2 heterozygous tall pea plants. Tall (T) is dominant to short (t). What fraction of the offspring do you predict will be tall?

a)

1/4

b)

2/4

c)

3/4

d)

4/4

5.

In pea plants, tall (T) is dominant over short (t). If two heterozygous tall pea plants are mated, what is the the expected genotypic ratio of their offspring?

a)

3 tall : 1 short

b)

1 TT : 2 Tt : 1 tt

6.

In the problem shown, what must the genotype of the missing parent be?

a)

BB

b)

Bb

c)

bb

7.

In humans, freckles (F) on the skin are dominant to no freckles (f).  If a heterozygous parent and a recessive parent conceive, what is the chances of having a child with NO FRECKLES?

a)

0%

b)

50%

c)

100%

8.

In guinea pigs, the allele for rough coat (R) is dominant over the allele for smooth coat (r).  A homozygous dominant guinea pig and a homozygous recessive guinea pig are mated.

What would be the phenotype of the offspring?

a)

100% rough coat

b)

100% smooth coat

9.

Genotype: rr

a)

homozygous dominant

b)

homozygous recessive

c)

heterozygous dominant

10.
What goes in box 3
a)
Aabb
b)
AABB
c)
AAbb
d)
aaBb
11.
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%
12.
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
d)
Rryy
13.

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

14.
A red flowered plant (RR) breeds with a White flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance.  What percentage of the offspring will have pink (RW) flowers?
a)
0%
b)
25%
c)
50%
d)
100%
15.
This type of inheritance pattern is a MIXTURE of both traits.
a)
incomplete dominance
b)
co-dominance
c)
complete dominance
d)
recessive pattern
16.
This type of inheritance pattern shows BOTH traits in possible offspring
a)
complete dominance
b)
incomplete dominance
c)
co-dominance
d)
dominant pattern
17.
This is an example of ___________?
a)
Incomplete dominance
b)
Co-Dominance
18.
This is an example of ___________.
a)
 Incomplete Dominance
b)
 Codominance
19.

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

a)

25%

b)

50%

c)

75%

d)

100%

20.

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 black?

a)

25

b)

50

c)

75

d)

100

21.

On a pedigree, this symbol represents a ---

a)

not affected female.

b)

not affected male.

c)

affected male.

d)

affected female.

22.

On a pedigree, this symbol represents a ----

a)

not affected male.

b)

not affected female.

c)

affected male.

d)

affected female.

23.
How many generations are shown in this pedigree?
a)
1
b)
2
c)
3
d)
4
24.
How many kids did the mother and father from the first generation have?
a)
2
b)
4
c)
5
d)
6
25.
There are no carriers for Huntington's Disease- you either have it or you don't. Is Huntington's disease caused by a dominant or recessive trait?
a)
Dominant
b)
Recessive
26.
Huntington's Disease is a dominant trait.
What is the correct genotype for individual I-2?
a)
HH
b)
Hh
c)
hh
d)
H_
27.
What do half colored symbols represent?
a)
The individual is a carrier (heterozygous).
b)
The individual expresses the trait.
c)
The individual has both recessive alleles.
d)
The individual has both dominant alleles.
28.
Why do all the daughters in Generation II carry the colorblind gene?
a)
Because mom passed on the gene.
b)
Because dad passed on the X chromosome.
c)
Because their brother has it.
d)
Because their brother gave it to them.
29.

This pedigree represents the inheritance of hemophilia in this family. How many of the males DO NOT HAVE the hemophilia trait?

a)

8

b)

5

c)

2

d)

3

30.

Which of the following genotypes shows a CARRIER for a trait?

a)

XBXb

b)

XbXb

c)

XBXB

d)

XbY

31.
What do we use pedigrees for?
a)

To determine the phenotype of the offspring

b)

To determination the genotype of the offspring

c)

To trace traits in families

d)

To determine which gene is dominante

32.

Which of the following genotypes shows a CARRIER for a trait?

a)

XBXb

b)

XbXb

c)

XBXB

d)

XbY

33.

Colorblindness is a recessive X-linked disorder.

Which genotype represents a male with normal vision?

a)

XN YN

b)

Xn Yn

c)

XN Y

d)

Xn Y

34.

What is 1 examples of an X-linked genetic disorder?

a)

Huntington's Disease

b)

Down's Syndrome

c)

Colorblindness

d)

Diabetes

35.

Huntington's Disease is an autosomal dominant disorder. What would the genotype of an affected person be?

a)

Hh

b)

hh

c)

HH

d)

none of these

36.

A gene that is located on 1 of the first 44 chromosomes is called _____.

a)

autosomal

b)

x-linked

c)

dominant

d)

recessive

37.
Which of the following genotypes belongs in the red box in the Punnett square?
a)
XBXb
b)
XbXb
c)
XbY
d)
XBY
38.
Different variations of a gene are called?
a)
Alleles
b)
DNA
c)
Chromosome
d)
Gene
39.

Colorblindness is more common in males than in females because......

a)

fathers pass the allele for colorblindness to their sons only

b)

the allele for colorblindness is located on the Y chromosome

c)

the allele for colorblindness is recessive and located on the X chromosome

d)

males who are colorblind have two copies of the allele for colorblindness

40.

Colorblindness is a recessive X-linked disorder.

Which genotype represents a male with normal vision?

a)

XN YN

b)

Xn Yn

c)

XN Y

d)

Xn Y

41.
The sex of a child is determined by
a)

whether the father's sperm contains an x or y chromosome

b)

whether the mother's egg contains an x or y chromosome

c)

the age of the parents

d)

whether the mother's egg contains an xx or xy

42.

What would the genotype be of a colorblind male?

a)

XNY

b)

XNYn

c)

XnY

d)

XnYn

43.

How many recessive genes does a carrier female have for colorblindness?

a)

1

b)

2

c)

0

d)

3

44.

Colorblindness is a sex-linked recessive trait. A colorblind woman marries a male with normal color vision. What is the percent chance of them having a color blind son?

a)

0%

b)

25%

c)

50%

d)

75%

45.

The woman who is colorblind marries a man with normal vision. What is the probability that their sons will be colorblind?

a)

0%

b)

25%

c)

50%

d)

100%

46.
What is the genotype of the mother?
a)
BB
b)
bb
c)
Bb
d)
BB or Bb
47.
This pedigree represents the inheritance of hemophilia in this family. How many of the females have the hemophilia trait?
a)

8

b)

5

c)

2

d)

3

48.
What do half colored symbols represent?
a)
The individual is a carrier (heterozygous).
b)
The individual expresses the trait.
c)
The individual has both recessive alleles.
d)
The individual has both dominant alleles.
49.

Which best explains why males cannot be carriers of X-linked traits?

a)

Males only have one X chromosome

b)

Males have two copies of the X chromosome

c)

Males can be heterozygous for a particular trait

d)

Males do not have an X chromosome

50.

A woman who is a carrier for the sex-linked trait hemophilia has children with a man with hemophilia. What percentage of offspring would be expected to have hemophilia?

a)

0%

b)

25%

c)

50%

d)

75%

51.
Which of the following genotypes belongs in the red box in the Punnett square?
a)
XBXb
b)
XbXb
c)
XbY
d)
XBY
52.
What is the genotype of the mother?
a)
BB
b)
bb
c)
Bb
d)
BB or Bb
53.

Look at this cross: XB XB x Xb Y

What proportion/percent of the male children are colorblind (b)?

a)

100%

b)

75%

c)

25%

d)

0%

54.

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

d)

female with white eyes

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