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Genetics Unit Review
Genetics Unit Review
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review of genetics unit for GB2
Flashcards
70 cards
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Practice quiz
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Questions
70
Answers
1
Crossing a homozygous red bull with a homozygous white cow makes Roan (red and white spotted) offspring due to
Dominance
Codominance
Independent assortment
Incomplete dominance
2
Crossing two heterozygous pink snapdragons can yield red, white and pink phenotypes. This is due to:
Codominance
Incomplete dominance
Dominance
Recessive
3
Meiosis ensures that sperm/egg receive only ___ copy of each gene
3
2
1
4
4
What is the inheritance pattern of this trait?
Autosomal Recessive
X-linked Dominant
Autosomal Dominaint
X-linked Recessive
5
What is the pattern of inheritance of the following trait?
Autosomal Recessive
X-Linked Dominant
Y-Linked
X-linked Recessive
6
What does this symbol represent?
Affected female
Affected male
Unaffected male
Unaffected female
7
The 2 alleles you have for a gene make up your
Heterozygous
Homozygous
Genotype
Phenotype
8
A recessive trait would appear in the phenotype of which of these?
tt
Tt
TT
TS
9
Which is true of X-linked dominant inheritance?
Affected females pass on to all offspring
Affected males have affected sons
Affected fathers pass on trait to all daughters
Affected mothers must have affected sons
10
Human variation in skin color, hair color, & height are all the result of
Incomplete dominance
Polygenic traits
Multiple alleles
Codominance
11
Two heterozygous tall pea plants are crossed. What is the phenotypic outcome?
75% tall, 25% short
100% short
100% tall
50% tall, 50% short
12
Which of the following genotypes could be described as homozygous?
Bb
BB
bbAA
BbAa
13
Different forms of a gene are called
Proteins
Alleles
Genes
DNA
14
The ABO blood gene is an example of
Multiple alleles
Codominance
Incomplete dominance
A polygenic trait
15
When many ______ control a trait, you will have more phenotypes
Alleles
Proteins
Genes
DNA
16
Explain the inheritance of this rare trait in the pedigree.
Autosomal Recessive
Autosomal Dominant
Y-Linked
X-Linked Recessive
17
What process produces recombination?
Crossing Over
Independent Assortment
Fertilization
Mitosis
18
The only way someone can display a recessive phenotype is if they are _________ for that trait
Homozygous dominant
Heterogeneous
Homozygous recessive
Heterozygous
19
Parent:
NnPp x nnpp.
Which of these would be a correct recombinant vs parental analysis?
D
C
A
B
20
What are linked genes?
Genes near each other on a chromosome that inherit together
Genes that can be found on two different chromosomes
Genes that are far apart on the same chromosome
Genes that produce the same phenotype
21
Meiosis makes
Gametes
Sex cells
Sperm
Eggs
22
What is the combination frequency of these genes?
8%
33.3%
12%
25%
23
What is the genotype indicating a person is male?
XXY
XX
XY
YY
24
What does this symbol represent?
Affected male
Unaffected male
Affected female
Unaffected female
25
Is this an example of linked genes?
Yes
No
Maybe
Idk
26
If R=Round and r=wrinkled, whilst G=Yellow and g=green for peas, what does RrGg code for?
Round and Yellow
Round and green
wrinkled and Yellow
wrinkled and green
27
Genes don't all sort independently. Most genes are stuck together in large clusters called
Chromosomes
Alleles
Linkage groups
Proteins
28
A situation in which the expression of one gene blocks the expression of another is called
Dominance
Incomplete dominance
Epistasis
Codominance
29
Heredity is
Alleles
The inheritance of traits
Genes
Proteins
30
The device illustrated used to organize genetic analysis is called a
Mendelian box
genetic graph
phenotypic paradox
punnett square
31
Saying a cat has black fur describes its:
genetics
recessive
phenotype
genotype
32
A single gene may lead to multiple phenotypic results in an individual (see image). This is an example of
Incomplete Dominance
A Polygenic Trait
A Pleiotropic Trait
Codominance
33
Which chromosome are sex linked conditions, such as haemophilia or r-g colourblind, carried on?
21
Y
1
X
34
How many genes are involved in a dihybrid cross?
2
4
3
1
35
True or false: linked genes are
always
inherited together
NOPE
?¿?
YUP
36
How many alleles for each gene can be found in an egg or a sperm cell?
2
4
1
3
37
What is the typical Mendelian Ratio when two heterozygous parents for two genes reproduce?
1:1
9:3:3:1
1:2:1
1:1:1:1
38
What would the offspring be of the Tall, round seed plant and the dwarf, wrinkled seed plant?
Tall, wrinkled seeds
Tall, Round Seeds
dwarf, wrinkled seeds
dwarf, Round Seeds
39
Which of pair of genes are most likely to be linked?
B & A
D & A
C & B
C & D
40
How many traits was Mendel analyzing (at a time) in his monohybrid cross experiments?
two
four
one
three
41
Freckles is dominant trait. What is the phenotype of box 1?
freckles
no freckles
42
Which is true of autosomal recessive inheritance?
At least one parent must have the phenotype
The trait is present in every generation
Affects more males than females
All offspring of affected parents are affected
43
What does sex-linkage mean?
Genes carried on the same autosomal chromosomes
Genes carried on the X chromosomes
Genes carried on different autosomal chromosomes
44
The generation that Mendel crossed to make his F
2
generation were the:
Parents
F1 generation
P generation
F2 generation
45
Freckles is a dominant trait. What is the genotype of box 4?
ff
FF
FFff
Ff
46
If two heterozygous tall plants are crossed, what are the possible genotypes of the offspring?
tt only
TT, Tt, and tt
TT and tt only
TT only
47
What do the letters inside the squares of a Punnett square represent?
offspring genotype
parent genotype
grandparent genotype
48
The principle that resulted from Mendel's 2-factor cross
Codominance
Independent Assortment
Dominance
Segregation
49
The branch of math that studies probability is
Geometry
Algebra
Calculus
Statistics
50
Cross-breeding the P-generation created F
1
plants that were
Hybrids
Heterozygous
Pure
Homozygous
51
Independent assortment proves that _____ can be inherited separately from each other
Genes
Chromosomes
Alleles
Segregation
52
What type of inheritance pattern is shown?
X-Linked Dominant
Autosomal Recessive
Autosomal Dominant
X-Linked Recessive
53
Crossing homozygous red snapdragons with homozygous white yields 100% pink due to
Codominance
Independent assortment
Dominance
Incomplete dominance
54
________ also means self-pollinating
White bread
In-bred
Cross-bred
True-bred
55
Which is true of autosomal dominant inheritance?
Affects more females than males
Unaffected parents can have affected offspring
Affected offspring have at least one affected parent
All offspring of affected parents are affected
56
The likelihood something will happen is called
Destiny
Luck
Karma
Probability
57
A person who inherits a Brown eye allele and a blue eye allele will have brown eyes because of
Principle of Incomplete dominance
Principle of Segregation
Principle of Codominance
Principle of Dominance
58
What is genetic recombination?
When genes move via transposons
When offspring have combos of traits different from parents
The exchange of genes between two organisms
When genes combine in fertilization, producing a zygote
59
If the parents genotypes were AAbb and aaBB, what would the genotypes of the offspring be?
AABB
aaBB
AaBb
AAbb
60
The principle of segregation refers to the segregation of:
genes
heterozygous
alleles
dihybrids
61
What is the recombination frequency of traits with 5 recombinants and 50 total offspring?
15%
5%
1%
10%
62
Which is true of Y-linked inheritance?
Very common traits
All male offspring of affected males are affected
Only females are affected
All offspring of affected males are affected
63
The unit that controls heredity is called a
DNA
Proteins
Enzyme
Gene
64
Having two different alleles for the same gene is called
heterozygous
homozygous
recessive
dominant
65
What is the first step in constructing a linkage map?
Graph your linkage map
Roll the 12-sided die
Find which offspring have parental vs recombinant genotypes
Calculatethe recombination frequency
66
Which of the following represents a heterozygous genotype?
TT
Tt
tt
67
If the parent plants have 100 offspring, how many will be short?
50%
75%
25%
100%
68
Based on this picture and your previous work, do you think the genes N and P are linked?
Yes
Its up in the air
Idk
No
69
Which is true of X-linked recessive inheritance?
Affected males pass on to sons
Every daughter of affected male must be affected
All daughters of affected mother are affected
Affects more males than females
70
What allele interaction leads to two dominant alleles for the same gene being expressed?
Recessive
Codominant
Dominant
Corecessive
