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Genetics Unit Review

Total questions: 50

Worksheet time: 56mins

Name
Class
Date
1.
How many cell divisions does meiosis have?
a)
1
b)
2
c)
4
d)
0
2.
Which is the correct sequence? 
a)
mitosis - gametes - zygote - meiosis - fertilization - embryo
b)
Fertilization-mitosis-zygote-gametes-meiosis-embryo
c)
meiosis-zygote-gametes-mitosis-fertilization-embryo
d)
meiosis-gametes-fertilization-zygote-mitosis-embryo
3.
A zygote has 4 chromosomes, how many chromosomes were in the gametes?
a)
2
b)
4
c)
8
d)
1
4.
What chromosome is affected by Down's Syndrome?
a)
23
b)
18
c)
13
d)
21
5.
What would indicate a human male?
a)
XX
b)
X
c)
XY
d)
XXY
6.
What is a picture used to examine chromosomes called?
a)
Sonogram
b)
Electrocardiogram
c)
X-Ray
d)
Karyotype
7.
The likely cause of genetic disorders is...
a)
Nondisjunction
b)
Overfertilization
c)
Uncontrolled Meiosis
d)
Translocation
8.
Which would be considered a somatic cell?
a)
Sperm cell
b)
Egg Cell
c)
Skin Cell
d)
All of these
9.
Which of the following would be considered a Gamete cell?
a)
Egg Cell
b)
Sperm Cell
c)
Both of these
d)
None of these
10.
How many chromosomes are in a typical human somatic cell?
a)
23
b)
22
c)
44
d)
46
11.
In humans, mitosis produces____ chromosomes and _____ chromosomes after Meiosis
a)
46, 46
b)
92, 46
c)
46, 23
d)
23, 23
12.
Determine the sex of the individual whose karyotype is displayed in the image.
a)
female
b)
male
13.

The activities in the cell cycle occur during specific phases. In which phase is DNA replicated ?

a)

Mitosis

b)

G1 phase

c)

G2 Phase

d)

S Phase

14.

Why is crossing over so important ?

a)

It maintains the number of chromosomes in a cell

b)

It ensures that the resulting cells are identical

c)

It creates multiple alleles

d)

It is a source of genetic variation

15.
Round seeds (R) are dominant over wrinkled seeds (r). What percentage of the offspring will be round from the following cross?
Rr X Rr
a)
100%
b)
75%
c)
50%
d)
25%
16.
Round seeds (R) are dominant over wrinkled seeds (r). What percentage of the offspring will be round from the following cross?
RR X Rr
a)
100%
b)
75%
c)
50%
d)
25%
17.
A tall pea plant (TT) is crossed with a short pea plant (tt). What percentage of the offspring will be tall?
a)
100%
b)
75%
c)
50%
d)
25%
18.
In pea plants, purple flowers are dominant to white flowers. If two white flowered plants are crossed, what percentage of their offspring will have white flowers?
a)
100%
b)
75%
c)
25%
d)
0%
19.
In guinea pigs, the allele for short hair is dominant over the allele for long hair.
B = short 
b = long
What genotype would a purebred short haired guinea pig have?
a)
BB
b)
bb
c)
Bb
20.
In guinea pigs, the allele for short hair is dominant over the allele for long hair.
B = short 
b = long
What would the cross be for two heterozygous guinea pigs?
a)
BB X BB
b)
BB X Bb
c)
Bb X Bb
d)
bb X bb
21.
How many affected females are present? 
a)
1
b)
2
c)
3
d)
4
22.

Shaded symbols represent Individuals with the dominant trait. Based on the Pedigree (Diagram), what are the most likely genotypes of the first relationship in the F1 generation?

a)

Male - aa Female - AA

b)

Male - Aa Female - AA

c)

Male - aa Female - Aa

d)

Male - Aa Female - aa

23.
How many carrier males are present? 
a)
2
b)
4
c)
6
d)
8
24.
This diagram represents what type of inheritance pattern?
a)
sex-linked inheritance
b)
complete dominance
c)
codominance
d)
incomplete dominance
25.
How many phenotypes are there in ABO blood types?
a)
3
b)
4
c)
6
d)
12
26.
What is this diagram called?  What do the circles represent?
a)
karyotype, males
b)
karyotype, females
c)
pedigree, females
d)
pedigree, males
27.
What is this tool used for?
a)
to compare DNA of two individuals
b)
read braille
c)
analyze genetic disorders in many generations of individuals
d)
analyze genetic disorders in one individual
28.
How many children do #5 & #6 have?
a)
1 male child
b)
2 male and 2 female children
c)
2 male children
d)
1 daughter and 1 son
29.
If this image were real, it would represent what type of inheritance?
a)
incomplete dominance
b)
codominance
c)
polygenic inheritance
d)
compete dominance
30.
The image shows the pattern of inheritance for colorblindness.  From this diagram we can tell that colorblindness is
a)
a codominant trait
b)
a sex-linked trait
c)
carried on the Y chromosome
d)
is associated with a dominant allele
31.
The phenotype is the _______________.
a)
physical appearance of an organism
b)
Genetic makeup 
c)
Alleles acquired from a specific parent.
32.
An allele whose trait only shows up when no dominant allele is present.
a)
hidden allele
b)
dominant allele
c)
recessive allele
d)
present allele
33.
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%
34.
Which is the genotype of a male with a dominant sex-linked trait carried on the X chromosome? 
a)
XDY
b)
XDXD
c)
XDYD
d)
XdY
35.
Which two genotypes would have the same blood type?
a)
IAIA and IAi
b)
IBIB and IAIB
c)
IBi and ii
d)
IAIA and IAIB
36.

In Pea Plants the allele for smooth pods (S) is dominant over wrinkled pods (s). A Homozygous plant with smooth pods is crossed with a plant that has wrinkled pods. Which of the following will be the ratio of genotypes for the F2 Generation?

a)

100% Ss

b)

50% SS, 25% Ss, 25% ss

c)

100% SS

d)

25% SS, 50% Ss, 25% ss

37.

Albinism is an autosomal recessive condition. Which circle graph shows the genotype probability when an albino female mates with a male that is heterozygous for the albinism trait?

a)
b)
c)
d)
38.
Dominant traits are traits that must show. What is the correct symbol for a dominant trait
a)
capital letter
b)
lower case letter
rR
c)
two lower case letters
rr
d)
a plus sign
RrR
39.
recessive traits are :
a)
one lower case letter
b)
two lower case letters
c)
three lower case letters
d)
four lower case letters
40.
Heterozygous means...
a)
two of the same allele
b)
two different traits allele
c)
two different chromosomes
d)
four different allele
41.
This diagram illustrates ________ which occurs during ________.
a)

reverse transcription
b)
point mutation, DNA replication
c)
crossing over, meiosis
d)
DNA replication, cell cycle
42.

The failure of one or more pairs of homologous chromosomes or sister chromatids to separate "normally" during meiosis is called _____________________.

a)

nondisjunction

b)

anaphase I

c)

nondiploidy

d)

karyotype

43.
Who is the "Father of Genetics"?
a)
Gregor Mendel
b)
Reginald Punnett
c)
Albert Einstein
d)
Carolus Linneaus
44.
Which of the following is an example of incomplete dominance?
B=Blue Bananas
Y=Yellow Bananas
a)
Bb=Blue Bananas
b)
BY=Green Bananas
c)
Yy=Yellow Bananas
d)
BY=Blue and Yellow Bananas
45.
When two or more genes control one single trait.
a)
Multiple Alleles
b)
Several Genes
c)
Polygenetic Traits
d)
Genotype
46.

Exposure to the chemical Asbestos causes a mutation that leads to the formation of a Tumor or Cancer. Which statement explains why the mutation is not passed on to offspring?

a)

Mutation occurs in Gametic Cells

b)

Mutation occurs in Somatic Cells

c)

Mutation is Recessive

d)

Mutation is Sex-Linked

47.

What is Gel electrophoresis used for?

a)

Determines differences in ages of people

b)

identifies genetic relationships

c)

determines effectiveness of medicines

d)

identifies blood types

48.

A mutation that passed from parent to offspring occurs in

a)

Somatic Cells

b)

Gametic Cells

c)

Meiosis

d)

when a parent is exposed to harmful substances

49.

The figure shows two homologous chromosomes undergoing a mutation. This mutation is most likely

a)

inversion

b)

translocation

c)

deletion

d)

substitution

50.

Gametes are produced by organisms for reproduction. In every gamete there is a combination of genes. This combination is...

a)

the same because its created from the same DNA

b)

the same because chromosomes are copied prior to mitosis

c)

different due to DNA replication prior to mitosis

d)

different due to independent assortment during meiosis

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