NEW
Font size
S
M
L
XL
WorksheetsGenetics review 2021
Total questions: 65
Worksheet time: 1hrs 24mins
Name
Class
Date
1.
An organism’s physical appearance is its
a)
dominance
b)
genotype
c)
phenotype
d)
allele
2.
Factors that control traits are called
a)
genetic disorders
b)
genes
c)
chromosomes
d)
RNA
3.
Mutations can be...
a)
Harmful
b)
Beneficial
c)
Neutral
d)
All of the Above
4.
------is the combination of two alleles that are different from one another.
a)
homozygous
b)
heterzygous
c)
phenotype
d)
trait
5.
The letters that make-up the genetic code for a trait
a)
genotype
b)
heterzygous
c)
phenotype
d)
trait
6.
---- Is the combination of two alleles that are the same
a)
genotype
b)
homozygous
c)
phenotype
d)
trait
7.
----is the type of gene that always shows itself when present
a)
genotype
b)
homozygous
c)
phenotype
d)
dominant
8.
Black fur (B) is dominant. Find the probability of a black offspring in a cross: bb x bb.
a)
0%
b)
25%
c)
50%
d)
100%
9.
Look at the Punnett Square. What's the probability of having the recessive offspring?
a)
100%
b)
75%
c)
50%
d)
25%
10.
What are the parents' genotypes?
a)
Homozygous for brown eyes
b)
Heterozygous for brown eyes
c)
Homozygous for blue eyes
d)
Heterozygous for blue eyes
11.
What is the phenotype for the recessive trait?
a)
brown eyes
b)
green eyes
c)
blue eyes
12.
A type of gene that can be hidden is called
a)
genotype
b)
recessive
c)
dominant
d)
allele
13.
Sickle cell disease (abnormally shaped red blood cells) is a recessive disease in humans. Which gene combination(s) would result in someone being affected by sickle cell disease?
a)
SS
b)
ss
c)
Ss
14.
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
d)
Tall
15.
If red flowers (R) are dominant over white, what is the probability that the offspring will be red?
a)
1 out of 4
b)
2 out of 4
c)
3 out of 4
d)
4 out of 4
16.
The device used to predict genetic outcomes.
a)
Geneticist
b)
Fate
c)
Punnett Square
d)
Pedigree
17.
An organism's phenotype describes its __________.
a)
genetic makeup
b)
physical appearance
18.
How many chromosomes are found in human egg and sperm cells?
a)
20
b)
23
c)
26
d)
46
19.
An organism's genotype describes its __________.
a)
genetic makeup
b)
physical appearance
20.
A recessive trait only shows up when __________.
a)
two dominant alleles are present
b)
one dominant allele is present
c)
two recessive alleles are present
d)
at least one dominant allele is present
21.
If you cross two parents, both with genotype Bb, what percentage of children will have brown eyes?
a)
25%
b)
50%
c)
75%
d)
100%
22.
Purebred is another word for __________, while hybrid is another word for __________.
a)
dominant; recessive
b)
recessive; dominant
c)
homozygous; heterozygous
d)
heterozygous; homozygous
23.
The two different forms of a gene are called _________.
a)
zygotes
b)
traits
c)
phenotypes
d)
alleles
24.
The letters that represent the traits. Ex: TT, Tt, or tt
a)
Phenotype
b)
Genotype
c)
Heterozygous
d)
Allele
25.
The physical results of the trait. Ex: Brown hair or blue eyes
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
26.
Two alleles that are the same. Ex: TT or tt
a)
Dominant
b)
Recessive
c)
Homozygous
d)
Heterozygous
27.
Two alleles that are different.
Ex: Tt
a)
Homozygous
b)
Heterozygous
c)
Dominant
d)
Recessive
28.
The allele that is expressed if different alleles are together. Represented by a capital letter. Ex: T
a)
Dominant
b)
Recessive
c)
Homozygous
d)
Genotype
29.
A change in DNA:
a)
Mutation
b)
Phenotype
c)
Genotype
d)
Albinism
30.
When gene pairs are written, the dominant allele is shown as a(n):
a)
D in front of it
b)
Capital Letter
c)
Bold letter
d)
Underlined letter
31.
Using the letter "P", what is the genotype of a heterozygous individual?
a)
Pp
b)
PP
c)
pp
d)
Ppp
32.
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%
33.
What type of inheritance do two alleles have if their traits blend together?
a)
Incomplete Dominance
b)
Co-Dominance
34.
This is an example of ___________?
a)
Incomplete dominance
b)
Co-Dominance
35.
A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?
a)
Incomplete Dominance
b)
Co dominance
36.
This is an example of ___________.
a)
Incomplete Dominance
b)
Codominance
37.
Which type of inheritance causes both traits to be expressed equally in the heterozygote?
a)
Complete Dominance
b)
Incomplete Dominance
c)
Co-Dominance
d)
Sex-linked
38.
In chickens, feather color is codominant. If a black chicken BB is mated with one that is black and white (BW) what are the chances of having a chicken that is black and white?
a)
50%
b)
0%
c)
25%
d)
100%
39.
In some carnations, flower color exhibits codominance. Identify the correct genotypes for red, white, and speckled carnations.
a)
Red = RR, white = rr, speckled = Rr
b)
Red = RR, white = WW, speckled = rw
c)
Red = RR, white = ww, Speckled = Rw
d)
Red = RR, white = WW, speckled = RW
40.
Which of the following is a hybrid?
a)
BB
b)
bb
c)
Bb
41.
this image is an example of
a)
codominance
b)
dominance
c)
incomplete dominance
42.
How many alleles does an individual have for each trait?
a)
1
b)
2
c)
3
d)
4
43.
If you cross a red snapdragon with a white snapdragon, only pink snapdragons will be produced. What type of inheritance pattern does this follow?
a)
Complete Dominance
b)
Incomplete Dominance
c)
Co-Dominance
d)
Sex-linked
44.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
45.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
46.
What type of heredity is shown in the pedigree?
(hint: check your notes - "modes of inheritance")
(hint: check your notes - "modes of inheritance")
a)
Sex-Linked Dominant
b)
Sex-Linked Recessive
c)
Autosomal Dominant
d)
Autosomal Recessive
47.
If this pedigree shows a recessive disorder, what MUST the genotype of individual 4 be?
a)
HH
b)
Hh
c)
hh
48.
In a pedigree, what shape represents a male?
a)
circle
b)
square
c)
triangle
d)
diamond
49.
How many generations are shown in this pedigree?
a)
1
b)
2
c)
3
d)
4
50.
How many kids did the mother and father from the first generation have?
a)
2
b)
4
c)
5
d)
6
51.
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
52.
Huntington's Disease is a dominant trait.
What is the correct genotype for individual I-2?
What is the correct genotype for individual I-2?
a)
HH
b)
Hh
c)
hh
d)
H_
53.
Does this pedigree show a dominant or recessive trait?
a)
Dominant
b)
Recessive
54.
Hemophilia is a recessive sex-linked trait. If H = normal & h = has hemophilia, which genotype represents a male with hemophilia.
a)
XHY
b)
XHXh
c)
XhXh
d)
XhY
55.
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.
56.
How many alleles does a person carry for a trait?
a)
1
b)
2
c)
3
d)
4
57.
Aa, DD, Bb, yy are all examples of ---
a)
genotypes.
b)
phenotypes.
58.
What do we use pedigrees for?
a)
To look at families
b)
To make determinations about the offspring
c)
To track traits in families
d)
Nothing
59.
In a pedigree, which shape represents a male?
a)
circle
b)
square
60.
What is the mode of inheritance shown here?
a)
Recessive because it "skips" a generation
b)
Dominant because it shows up in every generation
61.
How many girls in this family express this recessive disorder?
a)
4
b)
5
c)
6
d)
7
62.
How many kids did the mother and father from the first generation have?
a)
2
b)
4
c)
5
d)
6
63.
Is this trait (the shaded individuals) dominant or recessive?
a)
dominant
b)
recessive
64.
What does a horizontal line between a square and a circle mean?
a)
They are siblings
b)
They are cousins
c)
They are married ("together")
d)
They are the children
65.
What does a vertical line coming down from a square and circle that are connected by horizontal line indicate?
a)
They are cousins
b)
The children
c)
Aunts and Uncles
Reset
