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1
Mendel chose to work with garden pea plants because _______________.
A)they are small and easy to grow
B)they produce large numbers of offspring and mature quickly
C)the reproductive organs of the pea are enclosed within the flower and are self-pollinating
D)all of the above
2
In Mendel's experiment, a cross of a heterozygous purple-flowered plant (Ww) with a homozygous white-flowered plant (ww) will produce ____________.
A)25% white-flowered offspring.
B)100% purple-flowered offspring.
C)50% homozygous purple-flowered offspring.
D)50% heterozygous purple-flowered offspring.
3
The condition that results from one allele affecting more than one trait is _____________.
A)incomplete dominance.
B)pleiotropy.
C)partial dominance.
D)codominance.
4
Mendel's theories of segregation and independent assortment are so well supported by experimental results that they are considered "laws".
A)True
B)False
5
Nondisjunction occurs during ____________________.
A)mitosis.
B)meiosis I.
C)meiosis II.
D)both b and c.
6
Down syndrome results from _________________.
A)the absence of chromosome 21.
B)the presence of an extra chromosome number 21.
C)the absence of two chromosome number 21.
D)crossing over on chromosome number 21.
7
Which of the following is the result of nondisjunction of the sex chromosomes?
A)Down syndrome
B)Barr body
C)Turner syndrome
D)Phenylketonuria
8
Which one of the following genetic disorders is carried by a dominant allele?
A)Huntington's disease
B)Sickle-cell anemia
C)Tay-Sachs disease
D)Hemophilia
9
Males who inherit a XXY combination due to nondisjunction have the condition called _____________________.
A)Down syndrome
B)Klinefelter syndrome
C)Turner syndrome
D)hemophilia
10
Phenotype describes the actual alleles received from both parents.
A)True
B)False
11
Accidental changes in genes are called mutations.
A)True
B)False
12
A picture of an individual's particular array of chromosomes is called a pedigree.
A)True
B)False
13
Individuals who are heterozygous for sickle-cell anemia receive a benefit by not being as susceptible to malaria.
A)True
B)False
14
In a particular breed of cats black (B) is dominant and white (b) is recessive. What are the chances of producing white kittens when crossing a Bb male with a Bb female?
A)0%
B)25%
C)50%
D)75%
E)100%
15
What are the chances of producing black kittens from the above cross?
A)0%
B)25%
C)50%
D)75%
E)100%
16
Mendel's second law is often stated as genes located on different chromosomes are inherited independently of each other.
A)True
B)False
17
The significance of Morgan's experiments was that __________________.
A)it presented the first clear evidence that genes determining Mendelian traits do reside on chromosomes.
B)it illustrated the effects of polygenic traits on the inheritance of sex-linked traits.
C)chromosomal reduction through meiosis was proven.
D)a method to control economically important fruit flies resulted.
E)both a and d
18
Hemophilia involving a lack of blood protein factors VIII and IX is ______________.
A)a dominant trait that usually only develops in individuals in their 30s.
B)a recessive trait inherited on autosomes.
C)a sex-linked trait.
D)common in royal families due to several mutations in their genetic material.
E)a dominant trait inherited on autosomes.
19
To conduct his genetic experiments, Mendel began with subjects that were __________________.
A)haploid.
B)heterozygous.
C)true-breeding.
D)easy to count.
E)previously unstudied.
20
Which of the following represents an individual that is homozygous for the dominant trait?
A)bb
B)Bb
C)BB
D)aa
E)Aa





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