Site MapHelpFeedbackMultiple Choice Quiz
Multiple Choice Quiz
(See related pages)

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)40,000
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 straight 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 recessive 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
The normal chromosome number is referred to as _____________.
A)euploid
B)aneuploid
C)polyploid
D)tetraploid
15
The last pair of 23 chromosomes is referred to as the _____.
A)karyotype
B)autosomes
C)nondisjunction chromosomes
D)sex chromosomes
16
In Down's syndrome, there is an extra chromosome number _____.
A)19
B)20
C)21
D)22
17
Which chromosomes indicate a normal male fetus?
A)XX
B)XXY
C)XY
D)XYY







Hole's Human A&P 10eOnline Learning Center

Home > Chapter 24 > Multiple Choice Quiz