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Book cover image
Hole's Human Anatomy & Physiology, 9/e
David Shier, Washtenaw Community College
Ricki Lewis, The University at Albany
Jackie Butler, Grayson County Community College

Genetics

Multiple Choice Quiz

Please answer all questions



1

How many genes are believed to constitute the human genome?
A)one million
B)ten million
C)100,000
D)70,000
2

During which meiotic division is the number of chromosomes halved?
A)during meiosis I
B)during meiosis II
C)prior to meiosis I, during the S phase
D)after meiosis II
3

Choose the recessive human trait from the list that follows.
A)widow's peak
B)cheek dimples
C)hairless forearms
D)freckles
4

During which phase of meiosis does the phenomenon called crossing-over occur?
A)prophase I
B)metaphase I
C)telophase I
D)prophase II
5

Homologous chromosomes are separated during _______________.
A)prophase I
B)metaphase I
C)anaphase I
D)telophase I
6

Which of these does not contribute to genetic variability?
A)meiosis
B)crossing-over
C)having children with a close relative
D)having children with someone who is not a relative
7

Several variant forms of a gene for a given trait are called ______________.
A)autosomes
B)alleles
C)sex chromosomes
D)histones
8

A person who can pass either a widow's peak or continuous hairline to the next generation is said to be _______________ for the hairline trait.
A)homozygous
B)heterozygous
C)incompletely dominant
D)recessive
9

If a trait, such as hemophilia, occurs more often in males than in females, it is because the gene for the trait is most likely carried on ________________.
A)the X chromosome
B)the Y chromosome
C)a mutant allele
D)an autosome
10

If Chris, who carries the gene for cystic fibrosis but does not have the disease, fathers a child with Rhonda, who also carries the cystic fibrosis gene but does not have the disease, what is the likelihood that their first-born will have cystic fibrosis?
A)75% chance
B)50% chance
C)25% chance
D)0% chance
11

What is an example of a codominant trait in humans?
A)sickle cell disease
B)Huntington disease
C)ABO blood groups
D)Tay-Sachs disease
12

Traits that are controlled by one or more genes and influenced by the environment are said to be _________________.
A)incompletely dominant
B)multifactorial
C)polygenic
D)incompletely penetrant
13

The fact that a woman cannot generally grow a beard is because beard growth is a(n) ________________ trait.
A)completely penetrant
B)pleiotropic
C)sex-limited
D)sex-influenced
14

Individuals with Turner syndrome have which genetic abnormality?
A)two X and one Y chromosomes
B)three copies of chromosome 13
C)three copies of chromosome 18
D)one X chromosome; no Y chromosome
15

The normal chromosome number is referred to as _____________.
A)euploid
B)aneuploid
C)polyploid
D)tetraploid
16

The last pair of 23 chromosomes is referred to as the _____.
A)karyotype
B)autosomes
C)nondisjunction chromosomes
D)sex chromosomes
17

In Down's syndrome, there is an extra chromosome number _____.
A)19
B)20
C)21
D)22
18

Which of the following is most common?
A)Patau syndrome
B)Edward syndrome
C)Klinefelter syndrome
D)Turner syndrome
19

What is the most common chromosomal disorder in this group?
A)Patau's syndrome
B)Edward's syndrome
C)trisomy 13
D)trisomy 21
20

Which chromosomes indicate a normal male fetus?
A)XX
B)XXY
C)XY
D)XYY
21

What is the Turner's syndrome chromosome pattern?
A)XXY
B)XYY
C)XO
D)XXO
22

Which of the following fetuses will not survive?
A)XXY
B)XYY
C)XXXY
D)YY
23

Which chromosome pattern indicates a male with poor sexual development?
A)XYY
B)XXY
C)XY
D)XO
24

What type of inheritance is present in a person who has blue eyes and received a blue-eyed gene from each parent?
A)autosomal dominant
B)sex-linked
C)recessive
D)genetic