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Multiple Choice Quiz
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1

Alternate forms of a gene having the same position on a pair of chromosomes and affecting the same trait are called ______.
A)loci
B)alleles
C)chromatids
D)mutations
E)genotypes
2

Gregor Mendel worked with _______.
A)humans
B)rats
C)fruit flies
D)pea plants
E)corn
3

Mendel reasoned that an individual has ______ factor(s) for every trait.
A)one
B)two
C)three
D)four
E)any number of
4

Mendel also reasoned that gametes contain ______ factor(s) for every trait.
A)only one
B)two
C)three
D)four
E)any number of
5

The genetic factors ______ during the formation of the gametes.
A)combine or fuse
B)duplicate many times
C)segregate
D)disappear
E)express
6

Fertilization gives each new individual two factors for each trait.
A)True
B)False
7

A capital letter indicates a/an ______ allele.
A)inferior
B)dominant
C)superior
D)recessive
E)mutant
8

A recessive allele is expressed if there is no dominant allele present.
A)True
B)False
9

______ means that the two members of the allelic pair in the zygote are the same.
A)Homozygous
B)Heterozygous
C)Codominant
D)Dominant
E)Recessive
10

______ means that the members of the allelic pair are different.
A)Recessive
B)Homozygous
C)Allelopathic
D)Codominant
E)Heterozygous
11

The physical characteristics of the individual is called the phenotype.
A)True
B)False
12

It is possible to tell if an individual with a dominant phenotype is homozygous or heterozygous by inspection.
A)True
B)False
13

The members of each allelic pair separate during _________.
A)meiosis
B)mitosis
C)either meiosis or mitosis
D)fertilization
E)hybridization
14

___________ are heterozygous for only one pair of alleles.
A)Autosomal dominants
B)Sex-linked traits
C)Test crosses
D)Dihybrids
E)Monohybrids
15

The expected ratio for a monohybrid cross is _______.
A)1:1
B)2:1
C)3:1
D)9:3:3:1
E)12:6:6:4
16

If a child has a characteristic that neither parent has, the characteristic ____________.
A)is dominant
B)is recessive
C)must be a mutation
D)is not genetic but must have been acquired
E)is a complex of more than one gene and must be further tested
17

When solving genetic problems it is assumed that all possible types of sperm fertilize all possible types of eggs.
A)True
B)False
18

A testcross occurs when an individual with the dominant phenotype is crossed with an individual having the recessive phenotype.
A)True
B)False
19

A testcross is used to test if the individual showing a dominant gene is heterozygous or homozygous.
A)True
B)False
20

Segregation occurs because ______ chromosomes separate during meiosis.
A)heterozygous
B)homozygous
C)homologous
D)dominant and recessive
E)linked
21

Independent ______ occurs because each pair of homologous chromosomes separate independently of the others.
A)segregation
B)conjugation
C)assortment
D)differentiation
E)linkage
22

All alleles on the same chromosome are said to form a/an ______ group.
A)segregation
B)conjugation
C)assortment
D)differentiation
E)linkage
23

The law of independent assortment states that _________.
A)each pair of factors segregate independently of other pairs
B)all possible combinations of factors can occur in the gametes
C)both 1 and 2 are true.
D)genetic traits are independent of the genes on the chromosome
E)any assortment of genes is possible regardless of the parents genes
24

When doing a two-trait cross, the genotypes of the parents require how many letters?
A)one
B)two
C)three
D)four
E)eight
25

A ______ is when the individual is heterozygous at two genes.
A)monohybrid
B)dihybrid
C)trihybrid
D)bi-local hybrid
E)mutant
26

A 9:3:3:1 ______ ratio is expected for a dihybrid cross when simple dominance is present.
A)genotypic
B)dominance
C)phenotypic
D)polymorphic
E)backcross
27

A two-trait testcross occurs when an individual with the dominant phenotype for two traits is crossed with a homozygous recessive for both traits.
A)True
B)False
28

If any of the offspring of a two-trait testcross has a recessive phenotype, the parent with the dominant phenotype must be ______ for that trait.
A)homozygous
B)heterozygous
C)dominant
D)homozygous recessive
E)missing genes
29

Carriers have a normal phenotype but are capable of having a child with a genetic disorder.
A)True
B)False
30

If a child has a dominant characteristic, neither parent has to have the characteristic.
A)True
B)False
31

When a trait is governed by two or more sets of alleles, possibly located on many different pairs of chromosomes, it is called _____ inheritance.
A)dihybrid
B)incompletely dominant
C)polyphenotypic
D)polygenic
E)Mendelian
32

The common distribution of phenotypes for polygenic traits is a pattern of _____.
A)3:1
B)9:3:3:1
C)all or nothing
D)a bell-shaped curve
E)even continuous variation
33

Polygenic traits probably include _________.
A)skin color
B)height
C)behavior
D)all of the above
E)Mendel's pea plants
34

ABO alleles determine the presence or absence of ______ on the red blood cells.
A)hemoglobins
B)antibodies
C)antigens
D)plasma membranes
E)nuclei
35

Type O blood results from the inheritance of ______ .
A)two O alleles or one O allele and one A or B allele because O is dominant
B)one A and one B allele that cancel each other out to produce O type blood
C)two A or B alleles since this produces an O complex
D)two O alleles and they are recessive
36

Any chromosome that is not a sex chromosome in humans is __________.
A)an autosome
B)a chromatid
C)a sex-influenced trait
D)an asexual chromosome
E)of little importance in the development of organisms
37

Many genes on the sex chromosomes have nothing to do with sexual development.
A)True
B)False
38

Most sex-linked genes are on the ______ chromosome.
A)X
B)Y
C)both are equal
D)There are no genes on these chromosomes
39

A carrier female is normal but capable of passing on an allele for color blindness.
A)True
B)False
40

In sex-linked color blindness, the more commonly found are _________.
A)color-blind females
B)color-blind males
C)both are about equal
D)Color blindness is unrelated to sex-linkage.
41

A male inherits the color-blind allele from _________.
A)his father
B)his mother
C)either parent
42

In sex-linked color blindness, the daughter of a heterozygous woman and a normal man will be _________.
A)color-blind
B)normal
43

In sex-linked color blindness, the son of a heterozygous woman and a normal man has what chance of being color blind?
A)0%
B)50%
C)100%
44

The genes on the chromosome are arranged in a definite sequence.
A)True
B)False
45

Mendel's law of independent assortment would NOT hold for linked genes.
A)True
B)False
46

Traits controlled by linked genes tend to be inherited together.
A)True
B)False





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