WorksheetsGenetics Review
Total questions: 83
Worksheet time: 1hrs 8mins
Name
Class
Date
1.
Genotype refers to the ...
a)
physical expression of the genes
b)
the possible combination of alleles in a gene
c)
whether an allele is dominant or recessive
d)
how an organism will appear
2.
An offspring will receive how many alleles from each parent to determine a specific trait?
a)
one
b)
two
c)
three
d)
five
3.
Which of the following is a phenotype?
a)
BB
b)
Bb
c)
bb
d)
Blue eyes
4.
What is a phenotype
a)
The genetic make up (code)
b)
The physical trait
5.
the passing of genetic traits from parent to offspring.
a)
heredity
b)
trait
c)
gene
d)
allele
6.
having two of the same genes for the trait (sometimes called purebred).
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
7.
having two different genes for a trait (sometimes called hybrid).
a)
protein
b)
homozygous
c)
heterozygous
d)
genotype
8.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
a)
0 %
b)
25%
c)
50%
d)
75%
9.
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
10.
Snapdragon flowers come in red, pink and white. What type of inheritance is this?
a)
Complete Dominance
b)
Incomplete Dominance
c)
Codominance
d)
Polygenic Inheritance
11.
Incomplete dominance means that the traits are
a)
expressed equally
b)
dominant
c)
recessive
d)
blended
12.
One form of a gene is called_______________
a)
a DNA
b)
a Phenotype
c)
a trait
d)
an allele
13.
Which of the following genotypes is a purebred?
a)
Bb
b)
Gg
c)
bb
d)
Dd
14.
If green is dominant over purple, then what is the genotype for this individual?
a)
Purple
b)
Green
c)
GG
d)
gg
15.
Brown fur color is dominant over black fur color. Which of the following is the actual genotype of ALL of the offspring in the next generation of this cross for fur color?
AA x aa
AA x aa
a)
AA
b)
Aa
c)
aa
d)
brown fur
16.
Which is the correct phenotype for this organism?
a)
BB
b)
blue
c)
green
d)
bb
17.
Dominant alleles are-
a)
capital
b)
lowercase
c)
both
d)
neither
18.
Recessive alleles are-
a)
capital
b)
lowercase
c)
both
d)
neither
19.
Tt is-
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
20.
B=brown eyes
b= blue eyes
What is true about two brothers that have brown eyes?
One has genotype BB the other Bb.
b= blue eyes
What is true about two brothers that have brown eyes?
One has genotype BB the other Bb.
a)
they have same phenotype and genotype
b)
they have different genotypes and phenotypes
c)
they have same phenotype but different genotypes
d)
they have same genotype but different phenotypes
21.
W=white hair
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?
a)
none
b)
3/4
c)
1/2
d)
all
22.
Pea plants can have green or yellow seeds. In a pea plant that is heterozygous for seed color, the allele for yellow seeds masks the effects of the allele of green seeds. Which of the following terms best describes the allele for yellow seeds?
a)
codominant
b)
recessive
c)
dominant
d)
sex-linked
23.
In mussels, the allele for brown coloring (B) is dominant, and the allele for blue coloring(b) is recessive. For which parental genotypes are 100% of the offspring expected to be blue?
a)
BbxBb
b)
bbxbb
c)
BBxbb
d)
BBxBB
24.
Which of the characteristics is a lion least likely to pass on to its offspring?
a)
fur color
b)
length of tail
c)
scars on leg
d)
body size
25.
In guinea pigs, the alleles for black hair(B) is dominant to the allele for brown hair(b). Two black-haired guinea pigs are crossed. One of the pigs is homozygous for black hair and one is heterozygous. What percentage of their offspring are expected to have black hair?
a)
25%
b)
50%
c)
75%
d)
100%
26.
A dog gives birth to 5 puppies. What percentage of the chromosomes does each puppy share with the mother?
a)
25%
b)
50%
c)
75%
d)
100%
27.
The genotype of an organism describes the
a)
codons that make up the genes
b)
number of gene's on the chromosmes
c)
genetic make-up of a trait
d)
type of chromosomes in the nucleus
28.
Mark is a tall, 11 year old boy. He has a scar on his right cheek. He is intelligent and an excellent drummer. Which of his traits did he most likely inherit?
a)
height
b)
the scar
c)
his intelligence
d)
ability to play drums
29.
What characteristic would a child not inherit from parents?
a)
freckles
b)
eye color
c)
hair style
d)
dimples
30.
Two heterozygous (Tt)tall pea plants are crossed. Which describes their offspring?
a)
50% tall and 50% short
b)
75%tall and 25% short
c)
100%short
31.
Are recessive traits shown with capital or lowercase letters?
a)
Capital
b)
Lowercase
32.
The physical appearance or the way a gene looks is known as it's....
a)
genotype
b)
allele
c)
gene
d)
phenotype
33.
The mathematical chance that something will happen is known as...
a)
chance
b)
luck
c)
probability
34.
The different forms of genes are known as
a)
environment
b)
probability
c)
traits
d)
alleles
35.
An allele or gene that always shows is
a)
recessive
b)
dominant
c)
hidden
d)
present
36.
Two of the same genes for a trait (sometimes called purebred). BB or bb
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
37.
Two different genes for a trait (sometimes called hybrid). Bb
a)
protein
b)
homozygous
c)
heterozygous
d)
genotype
38.
What would the ratio for genotypes be for this Punnett Square?
a)
2Bb:2bb
b)
2BB:2Bb
c)
1BB:2Bb:1bb
d)
4Bb
39.
G = dominant green and y = recessive yellow
A fish has a Gy genotype, what will its phenotype be?
A fish has a Gy genotype, what will its phenotype be?
a)
yellow
b)
green
c)
greenish-yellow
d)
red
40.
T - tall and t = short
In the punnett square below, what belongs in the missing square
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
41.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
42.
A ________________________ is used to predict the possible genotype from certain parents
a)
Mendel Grid
b)
Genetic Tic Tac Toe
c)
Punnett Square
d)
Pedigree Plot
43.
Heredity is the passing of traits from _____________________ to _____________________
a)
predators to prey
b)
water to rain
c)
parents to offspring
d)
fungi to protists
44.
___________________________ is the field of science that studies of how traits are passed on, or inherited.
a)
dominant traits
b)
ratio
c)
phenotype
d)
genetics
45.
He is known as the father of modern day genetics.
a)
Gregory Mendel
b)
Greg Mendel
c)
Gregor Mendel
d)
Grace Mendel
46.
Which is a true statements about this picture?
a)
Brown is recessive
b)
Brown is dominant
c)
Blue is dominant
d)
Blue is codominant
47.
What are the possible phenotypes in this punnett square?
a)
Bb, bb, BB
b)
purple, white
c)
Bb, bb
d)
light purple
48.
What is a gene?
a)
An entire chromosome that codes for a trait
b)
a piece of clothing
c)
a piece of a DNA on chromosome that codes for a trait
d)
Chemical messengers in your brain that code for a trait
49.
What is a genotype?
a)
The genetic make up (code)
b)
The physical trait
50.
Tall is dominant to short. What is the phenotype of this organism?
Tt
Tt
a)
tall
b)
short
51.
Which of the following alleles is homozygous (purebred) recessive?
a)
Tt
b)
tt
c)
TT
d)
t
52.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous genes
d)
mutated DNA
53.
Aa is
a)
homozygous (purebred)
b)
heterozygous (hybrid)
54.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both
55.
G = green, g = yellow
The genotype for a yellow plant is...
The genotype for a yellow plant is...
a)
GG
b)
Gg
c)
gg
d)
all of the choices result in yellow
56.
How many alleles (letters) do each person carry for a trait?
a)
1
b)
2
c)
3
d)
4
57.
T - tall and t = short
In the punnett square below, what belongs in the missing square
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
58.
Which of the following is homozygous dominant?
a)
Yy
b)
Y
c)
yy
d)
YY
59.
In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any red-flowering plant resulting from this species?
a)
rr
b)
R
c)
RR
d)
RR or Rr
60.
In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the probability of having a white flowered plant if the parents were heterozygous red and homozygous red?
a)
0%
b)
25%
c)
50%
d)
100%
61.
W=white hair
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?
a)
none
b)
3/4
c)
1/2
d)
all
62.
In a Punnett square each box represents a(n)....
a)
offspring
b)
parent
c)
gene
d)
trait
63.
Who is considered the "father" of modern genetics?
a)
Einstein
b)
Mendel
c)
Disney
d)
Trump
64.
A single cross such as flower color.
a)
mono hybrid
b)
dihybrid
c)
crossing over
d)
homozygous
65.
What type of "square" helps us solve genetic problems?
a)
carpenter square
b)
Mendel square
c)
Punnett square
d)
genetic square
66.
TT,tt,PP,pp,SS,ss are examples of alleles that are?
a)
homozygous
b)
heterozygous
c)
different
d)
homologous
67.
The exact genetic makeup of an organism, such as RR, Tt, PP is its?
a)
phenotype
b)
dominance
c)
genotype
d)
trait
68.
Y for yellow body is dominant over y for blue body. What alleles would produce yellow bodies?
a)
YY,yy
b)
Yy,yy
c)
YY only
d)
YY,Yy
69.
"The Great White Shark was 20 feet in length. Phenotype or Genotype?
a)
phenotype
b)
genotype
70.
Females-XX; MalesXY. A couple has 4 girls. What is the chance the next child will be a boy?
a)
75%
b)
100%
c)
25%
d)
50%
71.
If "T" is the allele for tall and "t" is the allele for short, then Tt would produce?
a)
tall
b)
short
c)
medium
d)
not enough info
72.
A physical characteristic that can be passed from parent to offspring.
a)
behavior
b)
trait
c)
strong muscles
d)
ability to fly a plane.
73.
Autosomes are
a)
chromosomes found in autotrophs, only
b)
chromosomes that automatically correct all errors in the DNA
c)
chromosomes that determine traits other than sex
d)
chromosomes that determine the sex of the individual
74.
Which term refers to the physical expression of a gene?
a)
phenotype
b)
genotype
c)
hybrids
d)
generations
75.
Which term refers to an organism’s genetic make-up (combination of alleles)?
a)
phenotype
b)
co-dominance
c)
heterozygous
d)
genotype
76.
Mendel’s Law of _______ states that a random distribution of alleles occurs during gamete formation.
a)
segregation
b)
independent assortment
c)
meiosis
d)
dominance
77.
The letters on the top and side of a Punnett square represent __________.
a)
The chromosome mutation position
b)
The genotype of the offspring
c)
The possible alleles given by the parent following meiosis.
d)
The combination of male and female alleles.
78.
Which of the following best explains why it is impossible for males to be carriers for sex-linked traits?
a)
Males can only get the dominant form of sex-linked traits.
b)
Males only have one X chromosome, so there is no second allele to “mask” the recessive form.
c)
Males can only get the recessive form of the trait.
d)
Males have two Y chromosomes, so they don’t have sex-linked traits.
79.
The sex chromosomes of a human female are _____.
a)
XX
b)
XY
c)
YY
d)
neither
80.
Carriers do not display the recessive phenotype but are able to pass on an allele for the recessive phenotype to their offspring.
a)
True
b)
False
81.
Carriers can also be described as _____.
a)
homozygous recessive
b)
homozygous dominant
c)
heterozygous
82.
A disease caused by an autosomal primary nondisjunction is
a)
Turner syndrome
b)
Down syndrome
c)
Tay-Sachs disease
d)
PKU
83.
An individual who has two of the same allele is said to be
a)
homozygous
b)
homologous
c)
heterozygous
d)
diplozygous
100 %
