WorksheetsAnatomy & Physiology: Ch. 25
Total questions: 40
Worksheet time: 23mins
The units of hereditary are called
DNA
protein
genes
enzymes
Chromosomes contain
genes
DNA
alleles
all of the above
a recessive gene
is only found on the X chromosome
only alters the phenotype in homozygous individuals
only alters the phenotype in heterozygous individuals
never alters the phenotype
An individual that is heterozygous for a completely dominant trait
is a carrier
will show the dominant phenotype
will show the recessive phenotype
will show a phenotype intermediate between the dominant and recessive
phenotypes
An example of genotype is
heterozygous alleles
height
brown eyes
gender
If a person is a carrier for a particular disease,
the disease must be dominant, and the person's genotype must be heterozygous
the disease must be recessive, and the person's genotype must be heterozygous
the disease must be dominant, and the person's genotype must be homozygous
recessive
the disease must be dominant, and the person's genotype must be homozygous
recessive
The skin cells of the elephant contain 56 chromosomes. How many chromosomes will
an elephant spermatozoon contain?
56
23
46
28
A normal male has the genotype
XX
XY
XXY
XXX
An individual with the genotype XO would most likely be
male
female
both male and female
neither male or female
Which of the following is NOT a sex-linked trait?
hemophilia
red-green colour blindness
testicles
cystic fibrosis
Which of the following is NOT true of sex-linked disorders?
They are transmitted from mother to son.
They appear almost exclusively in males.
They are usually recessive traits.
They are usually carried on the Y chromosome.
Eye colour is determined by three pairs of genes. Its mode of inheritance is best described
as
multifactorial
sex-linked
recissive
dominant
The ability of a particular gene to determine phenotype can be altered by
environmental factors
gender
other genes
all of the answers are correct
Which of the following is true of multifactorial traits?
They always cause disease
They are inherited by fathers only
They are determined by more than one gene pair
They are inherited by mothers only
A chemical that causes a chromosome to break is called a(n)
mutation
talipes
mutagen
karyotype
All mutations are
harmful
the result of an agent
changes in the genotype
all of the answers are correct
A disorder that is congenital but NOT hereditary is
fetal alcohol syndrome
cystic fibrosis
Huntington disease
albinism
Huntington disease is
congenital, nonhereditary, and nongenetic
noncongenital, hereditary, and genetic
congenital, hereditary, and genetic
congenital, nonheriditary, and genetic
A chromophobe is afraid of
heights
colour
disease
bacteria
A disorder resulting from a change in chromosome number is
huntington disease
down syndorme
cystic firbosis
spina bifida
The threadlike nuclear bodies that contain the genes are called ______.
chromosomes
genes
DNA
autosomes
Genes are segments of a substance called ______.
chromosomes
DNA
autosomes
genotype
Human cells contain one pair of sex chromosomes and 22 pairs of ______.
chromosomes
genes
autosomes
DNA
A gene that only expresses its effect in a homozygous individual is termed _______.
recessive
genotype
phenotype
dominant
One's genetic makeup is called the ______.
recessive
genotype
phenotype
dominant
Eye colour is a trait that is part of an individual's ______.
recessive
genotype
phenotype
dominant
An individual who is heterozygous for a recessive gene is called a(n) ________.
carrier
male
female
karyotype
The number of chromosomes in a human ovum is ____.
21
22
23
24
The type of cell division that produces spermatozoa is called _____.
phenotype
meiosis
congenital
spermatozoon
In a species with 24 chromosomes in somatic cells, meiosis would result in germ cells
containing ______ chromosomes.
18
14
10
12
Normal females have ___ copies of the X chromosome.
one
four
two
eight
The gamete that determines the sex of the offspring is the _______.
pedigree
spermatozoon
autosomes
phenotype
Any trait carried on the X chromosome is described as _______.
karyotype
sex-linked
congential
mutation
Recessive sex-linked diseases are most common in individuals of the ______
gender.
male
female
Traits determined by more than one gene pair are termed _________.
pedigree
polydactyly
congenital
multifactorial
A change in the DNA sequence of a gene is an example of a(n) _______.
pedigree
polydactyly
mutation
multifactorial
Any disorder present at the time of birth is termed ___________.
congenital
hereditary
sex-linked
polydactyly
A baby with six fingers has a condition called ______.
pedigree
congential
polydactyly
multifactorial
Down syndrome results from an extra copy of chromosome ____.
22
21
18
16
The word part –cele means ____
bleeding
swelling
brusing
carrier
