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WorksheetsGenetics Review
Total questions: 65
Worksheet time: 2hrs 59mins
Name
Class
Date
1.
Having two of the same genes for the trait (TT, tt); Both dominant or both recessive.
a)
homozygous or purebred
b)
heterozygous or hybrid
c)
twin offspring
d)
pairs of chromosomes
2.
Which of the following alleles is homozygous (purebred) recessive?
a)
Tt
b)
tt
c)
TT
d)
t
3.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
4.
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%
5.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous genes
d)
mutated DNA
6.
Aa is
a)
homozygous (purebred)
b)
heterozygous (hybrid)
7.
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%
8.
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
9.
What gender has an X and a Y chromosome?
a)
male
b)
female
c)
transgender
d)
all of the above
10.
What is the cause of some traits "skipping" a generation?
a)
dominant traits
b)
recessive traits
c)
mutations
d)
natural selection
11.
Who is considered the "father of genetics"?
a)
Gregor Mendel
b)
Reginald Punnett
c)
James Watson
d)
Justin Bieber
12.
If one stronger trait "covers" up another weaker trait, the trait that covers the other is said to be:
a)
Dominant
b)
Heterozygous
c)
Recessive
d)
Hidden
13.
This type of inheritance pattern shows BOTH traits in possible offspring
a)
complete dominance
b)
incomplete dominance
c)
co-dominance
d)
dominant pattern
14.
Colorblindness is a recessive, X chromosome sex-link disorder. Cross the parents to figure out which percentage of their offspring will be colorblind.
a)
25%
b)
0%
c)
75%
d)
50%
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.
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%
17.
A human usually has _____ total chromosomes.
a)
6
b)
22
c)
4
d)
46
18.
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
19.
R=round seed
r=wrinkled seed.
Cross a homozygous round with a wrinkled. Which statement predicts the results?
r=wrinkled seed.
Cross a homozygous round with a wrinkled. Which statement predicts the results?
a)
offspring will be Rr
b)
offspring will be RR
c)
round seeds will be recessive to wrinkled
d)
Wrinkled will be observed in half of offspring
20.
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
21.
What is a phenotype?
a)
The expression of a trait; physical appearance.
b)
refers to the genetic makeup of an individual
c)
An organism that has the same genes for a trait (ex. TT or tt)
d)
the passing of traits from parent to offspring
22.
How many alleles (letters) does a child get from each parent for each trait?
a)
1
b)
2
c)
3
d)
4
23.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
24.
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
25.
In a pedigree, what shape represents a male?
a)
circle
b)
square
c)
triangle
d)
diamond
26.
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
27.
What genotype is missing from this Punnett Square?
a)
RrYy
b)
RRYY
c)
rryy
d)
RrYY
28.
A male beetle has the genotype Ttbb. If this beetle mates with a female with genotype TTBb, what is the chance their offspring will have the genotype TtBb?
a)
12.5%
b)
25%
c)
50%
d)
75%
29.
What fraction of offspring from the cross AaBB x Aabb will be heterozygous for both traits?
a)
1/16
b)
1/4
c)
1/2
d)
3/16
30.
A pattern of inheritance in which a trait is carried on one of the sex-determining chromosomes.
a)
Mendelian Inheritance
b)
Co-dominance
c)
Incomplete dominance
d)
Sex-linked inheritance
31.
A pattern of inheritance in which one allele is not completely dominant over the other. The heterozygous phenotype is a blend of both alleles.
a)
Mendelian inheritance
b)
Co-dominance
c)
Incomplete dominance
d)
Sex-linked inheritance
32.
A pattern of inheritance in which one allele is not completely dominant over the other. The heterozygous phenotype clearly expresses both alleles.
a)
Mendelian inheritance
b)
Co-dominance
c)
Incomplete dominance
d)
Sex-linked inheritance
33.
If a plant with the genotype SSGg is crossed with a plant with the genotype Ssgg, what percentage of the offspring will be heterozygous for both traits?
a)
75 %
b)
50%
c)
25%
d)
12.5%
34.
How many children of individuals I-1 and I-2 have Falconi anemia?
a)
1
b)
2
c)
3
d)
4
35.
What is the genotype of individual III-1?
a)
XfXf
b)
FF
c)
Ff
d)
ff
36.
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
c)
Independent assortment
d)
Recessive inheritance
37.
A roan cow shows co-dominance in fur color (orange and white). What is the phenotype ratio expected if a roan cow and a roan steer mate together?
a)
4: Orange and White
b)
1: Orange : 1 White
c)
2 Orange: 2 Orange and White: 0 White
d)
1: Orange: 2 Orange and White: 1 White
38.
How are Incomplete Dominance and Co Dominance different than a normal Mendelian cross?
a)
There is no difference
b)
The heterozygous genotype has a unique phenotype
c)
There is no heterozygous genotype
d)
There is only one phenotype regardless of genotype.
39.
A breed of chicken shows codominance for feather color. One allele codes for black feathers, another codes for white feathers. The feathers of heterozygous chickens of this breed will be:
a)
all black
b)
all white
c)
all gray
d)
speckled black and white
40.
The different forms of a gene are called
a)
traits
b)
pollinators
c)
alleles
d)
hybrids
41.
having two of the same genes for the trait (sometimes called purebred).
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
42.
Snap dragon color is a incomplete dominant trait. A red flower (RR) is crossed with white flower (rr)? What color are flowers that are Rr?
a)
Red
b)
Red and White
c)
White
d)
Pink
43.
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)
8/16
b)
0/16
c)
4/16
d)
16/16
44.
In Andalusian fowls, black individuals (BB) and white individuals (bb) are homozygous. Heterozygous individuals are grey (Bb).
What is the genotype ratio for a cross between a grey fowl and a white fowl?
What is the genotype ratio for a cross between a grey fowl and a white fowl?
a)
2 BB: 2 Bb: 0 bb
b)
0 BB: 4 Bb: 0 bb
c)
0 BB: 2 Bb: 2 b
d)
1 BB: 2 Bb: 1 bb
45.
In Andalusian fowls, black individuals (BB) and white individuals (bb) are homozygous. Heterozygous individuals are grey (Bb).
Cross a black fowl with a white fowl. What is the phenotype ratio?
Cross a black fowl with a white fowl. What is the phenotype ratio?
a)
4 black: 0 grey: 0 white
b)
2 black: 2 grey: 0 white
c)
0 black: 4 grey: 0 white
d)
0 black: 2 grey: 2 white
46.
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
47.
How many generations are shown in this pedigree?
a)
1
b)
2
c)
3
d)
4
48.
Which individual in the first generation is a carrier?
a)
The male
b)
The female
c)
individual 1
d)
None of the above
49.
How many kids did the mother and father from the first generation have?
a)
2
b)
4
c)
5
d)
6
50.
How many girls did the mother and father from the first generation have?
a)
2
b)
4
c)
5
d)
6
51.
In the second generation-how many people have the disease or display the physical trait?
a)
2
b)
4
c)
5
d)
6
52.
In the second generation-how many people are carriers of the trait?
a)
2
b)
3
c)
5
d)
6
53.
How many people in this whole pedigree have the trait/disease?
a)
2
b)
3
c)
4
d)
6
54.
How many people in the pedigree are carriers for the disorder?
a)
6
b)
8
c)
2
d)
9
55.
Examine the pedigree. The allele for the presence of a widow’s peak is dominant. Therefore, we can tell from the chart that in the couple labeled 2:
a)
the male is heterozygous and the female is homozygous.
b)
the male is homozygous and the female is heterozygous.
c)
the male is homozygous and the female is homozygous.
d)
the male is heterozygous and the female is heterozygous.
56.
The genotype of the affected son and daughter at the bottom of this pedigree...
a)
could be homozygous dominant
b)
could be homozygous recessive
c)
could be heterozygous
d)
Can't tell
57.
Which of the following cell types is a diploid
a)
ovum
b)
sex cell
c)
somatic cell
d)
gamete
58.
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
59.
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
60.
If a man does not have hemophilia (X linked trait), what percentage of his daughters will have hemophilia?
a)
100%
b)
75%
c)
50%
d)
0%
61.
If a couple has five boys, the probability that the next child will be a boy is _______.
a)
0%
b)
25%
c)
50%
d)
75%
62.
Autosomes
a)
Chromosomes 1-22
b)
Sex Chromosomes
c)
Oldsmobile
d)
gamete
63.
Mendel discovered that a ________ trait will sometimes disappear or go away in the next generation because it is overpowered by the ______ trait.
a)
dominant; recessive
b)
recessive; dominant
c)
darker; lighter
d)
lighter; darker
64.
Which law states that organisms inherit 2 copies of each gene and donate one to their offspring
a)
law of independent assortment
b)
law of segregation
c)
law of genetic linkage
d)
law of inheritance
65.
Which observation of dihybrid crosses led to Mendel's law of independent assortment
a)
Particular individual traits persisted for many generations
b)
Many combinations of traits were always inherited together
c)
Some combinations of traits were not passed onto offspring
d)
The presence of one trait didn't affect the presence of another
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