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Genetics Review

Total questions: 59

Worksheet time: 1hrs 9mins

Name
Class
Date
1.
In humans, hemophilia is an X-linked recessive trait. If a man and a woman have a son who is affected with hemophilia, which of the following is definitely true?
a)
The mother carries an allele for hemophilia
b)
The father carries an allele for hemophilia
c)
The father is afflicted with hemophilia
d)
both parents carry an allele for hemophilia
2.

The pedigree of a family with a history of a particular genetic disease is shown below. Squares represent males and circles represent females. Shaded symbols represent those who have the disease.


If Individual 2 were to marry a woman with no family history of the disease, which of the following would most likely be true of their children?

a)

All of the children would have the disease.

b)

None of the children would have the disease

c)

Only the sons would have the disease

d)

All of the sons would be carriers of the disease

3.

The pedigree of a family with a history of a particular genetic disease is shown below. Squares represent males and circles represent females. Shaded symbols represent those who have the disease


If Individual 6 marries a woman with the disease, what is the probability that their first child will have the disease?

a)

0

b)

25%

c)

50%

d)

75%

4.

PKU is an autosomal recessive disorder. A man is a carrier of PKU and his wife is heterozygous.

What is the probability they have a child who suffers from PKU?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

5.

Examine the pedigree of this family with a history of PKU. What is the genotype of person 3?

a)

HH

b)

Hh

c)

hh

d)

H?

e)

?h

6.

Examine the pedigree of this family with a history of PKU. Which are true of person 4? Pick all that apply.

a)

Person 4 is male

b)

Person 4 is heterozygous

c)

Person 4 has three other siblings

d)

Person 4's genotype is different from his/her siblings

e)

Person 4 does not suffer from PKU

7.

Hemophilia is a X-linked recessive disorder. A healthy man is married to a woman who suffers from hemophilia.

Which is/are true about their potential children? Pick all that apply.

a)

If the child is a girl, they would be healthy

b)

If the child is a boy, they would be healthy

c)

If the child is a boy, they would have hemophilia

d)

If the child is a girl, they would have hemophilia

e)

If the child is a girl, they would be carriers

8.

What is the genotype of person 4?

a)

XH XH

b)

XH Xh

c)

Xh Xh

d)

XH X?

9.

What is the genotype of person 10?

a)

XH XH

b)

XH Xh

c)

Xh Xh

d)

XH X?

10.

Which is true of X-linked disorders? Pick all that apply.

a)

the gene is found on an autosome

b)

men cannot be carriers of these disorders

c)

men inherit the disorder from the father

d)

they rarely affect women

e)

a man's Y chromosome can prevent this disorder

11.

The red flowered parent and white flowered parent produced the offspring with both red and white petals. What type of inheritance is this?

a)

incomplete dominance

b)

codominance

c)

X linked inheritance

d)

Y linked inheritance

e)

Autosomal inheritance

12.
How would you describe this genotype?
Bb
a)
Homozygous Dominant
b)
Homozygous Recessive
c)
Heterozygous
13.
How would you describe this genotype?
       dd
a)
Homozygous Dominant
b)
Homozygous Recessive
c)
Heterozygous
14.
In snapdragon flowers, Red is completely dominant to White.  What would be the phenotype of a Rr plant?
a)
Red
b)
White
c)
homozygous
d)
heterozygous
15.
In pea plants, smooth peas are dominant to wrinkled peas.  What would be the phenotype of a  "ss" plant?
a)
smooth
b)
wrinkled
c)
homozygous
d)
heterozygous
16.
How many chromosomes do humans have in their body cells?(skin cells, stomach cells...)
a)
42
b)
44
c)
23
d)
46
17.
If an animal has 20 chromosomes in their brain cells, how many are in their gametes? (sex cells)
a)
40
b)
20
c)
10
d)
60
18.
A cells has a haploid number of 20. What would be the diploid number before meiosis?
a)
20
b)
40
c)
10
d)
23
19.
The allele or trait that is visible and obeservable in an organism is defined as the __ allele.
a)
recessive
b)
homoztgous
c)
heterozygous
d)
dominant
20.
The allele that is hidden or not seen in heterozygous individuals.
a)
dominant allele
b)
recessive allele
c)
homologous chromosomes
d)
heterozygous chromosomes
21.
In the second generation-how many people are carriers of the trait?
a)
2
b)
3
c)
5
d)
6
22.
What is the genotype of the great-grandfather? (Individual 2)
a)
A_
b)
aa
c)
Aa
d)
AA
23.
How many girls in this family express this recessive disorder?
a)
4
b)
5
c)
6
d)
7
24.
Given that this is a recessive pedigree...
What is the genotype of individual II-3?
a)
aa
b)
Aa
c)
AA
25.
Which process is necessary for the inherited traits of an organism to be passed along by sexual reproduction?
a)
mitosis
b)
meiosis
c)
mutation
d)
fission
26.
Which statement correctly describes meiosis?
a)
cells divide only once
b)
meiosis does not occur in reproductive cells
c)
the cells produced at the end of meiosis are genetically identical to the parent cell
d)
The cells produced at the end of meiosis contain half the number of chromosomes as the parent cell
27.

Genotype or Phenotype: Freckles

a)

Genotype

b)

Phenotype

28.

Mutations are...

a)

Changes in the sequence of DNA

b)

Broken chromosomes

c)

Bad genes

29.

What type of mutation is shown?

a)

Point Mutation

b)

Trisomy

c)

Monosomy

d)

Gene Translocation

30.

Which kitten is most likely the offspring of this cat?

a)

1

b)

2

c)

3

d)

4

31.
In what type of trait are both alleles equally expressed in the heterozygous individual?
a)
Sex-linked traits
b)
Completely dominant traits
c)
Codominant traits
d)
Incompletely dominant traits
32.
In what type of traits is the phenotype of the heterozygous individual a mixture or blend of the two homozygous conditions?
a)
Sex-linked traits
b)
Completely dominant traits
c)
Codominant traits
d)
Incompletely dominant traits
33.
What type of trait is controlled by a gene with more than just two alleles?
a)
Polygenic inheritance
b)
Multiple alleles
c)
Codominance
d)
Incomplete dominance
34.
A red flowered plant (RR) is crossed 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%
35.
What type of inheritance do two alleles have if their traits blend together? 
a)
Incomplete Dominance
b)
Co-Dominance
36.
Which choice best represents the genotype of this cross?
a)
1 Yy: 2 yy: 0 YY
b)
2 Yy: 2 yy: 0 YY
c)
3 Yy: 1 yy: 0 YY
d)
1 Yy: 3 yy: 0 YY
37.

process in which homologous chromosomes exchange portions of their chromatids during meiosis

a)

crossing-over

b)

DNA replicatoin

c)

translation

d)

transcription

38.
Squidward has light blue skin, and his genotype for this trait is Bb. Would Squidward be considered a purebred or hybrid for light blue skin?
a)
Purebred
b)
Hybrid
39.
the passing of genetic traits from parent to offspring.
a)
heredity
b)
trait
c)
gene
d)
allele
40.

How can two parents with brown eyes have a child with blue eyes?

a)

The parents may both have a recessive gene for blue eyes.

b)

The child was born during the winter

c)

Eye color in humans is not an inherited trait

d)

The child was deprived of oxygen during its birth

41.
Which two processes are involved in protein synthesis?
a)
Replication and Transcription
b)
Replication and Translation
c)
Transcription and Translation
42.
Which of the following molecules is made during transcription?
a)
DNA
b)
tRNA
c)
protein
d)
mRNA
43.
Which of the following bases is found only in RNA?
a)
Adenine
b)
Guanine
c)
Thymine
d)
Uracil
44.
Which form of RNA carries amino acids from the cytoplasm to the ribosome?
a)
amino RNA
b)
ribosomal RNA
c)
transfer RNA
d)
messenger RNA
45.
What are the three base segments of mRNA called?
a)
anticodons
b)
codons
c)
triplets
46.
Transcribe the following sequence of DNA into RNA:
AAG   CTT   TGC
a)
TTC  GAA  ACG
b)
UUC  GAA ACG
c)
TTC  GUU  UCG
d)
UUC  GUU  UCG
47.
What would be the complementary DNA strand for the following nucleotide sequence?
TCG ATA CGA
a)
AGC ATA GCT
b)
AGC TAT GCT
c)
AGC UAU GCU
d)
UGC TUT GCT
48.
Cytosine always pairs with
a)
Adenine
b)
Thymine
c)
Uracil
d)
Guanine
49.
Which organelle is DNA usually found in?
a)
cell membrane
b)
vacuole
c)
ribosome
d)
nucleus
50.
In DNA, Adenine bonds with ______________.
a)
Guanine
b)
Thymine
c)
Cytosine
d)
Adenine
51.
In a molecule of double-stranded DNA, the amount of Adenine present is always equal to the amount of
a)
cytosine
b)
guanine
c)
thymine
d)
uracil
52.
The process to go from DNA to mRNA is _______
a)
translation
b)
transcription
c)
replication
53.
The process to go from mRNA to a protein is called ____
a)
transcription
b)
rRNA
c)
replication
d)
translation
54.
What amino acid is represented by the codon UUA?
a)
Phenylalanine
b)
Tyrosine
c)
Leucine
d)
Stop codon
55.
What process is going on in this photo? 
a)
Transcription 
b)
Translation 
c)
Replication 
d)
All the above 
56.
How many amino acids are coded for by this sequence of nucleotides:
ATG GGA ACT CCA
a)
4
b)
2
c)
6
d)
12
57.

What amino acid is represented by the codon AUG?

a)

Phenylalanine

b)

Methionine

c)

Leucine

d)

Stop codon

58.

If the DNA sequence of a gene is TAC CCC GGA GAG, what mRNA sequence will be produced in transcription?

a)

RNA Polymerase

b)

AUG GGG CCU CUC

c)

ATG GGG GGT GTG

d)

AUG GGG CCU CUG

e)

AUG CCG GCA CGG

59.
What is the correct amino acid sequence for the mRNA code AUGCCAGUAUGA
a)
Met-Pro-Ala-Val
b)
Met-Pro-Val
c)
Tyr-Gly-His
d)
Tyr-Gly-Arg-His

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