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WorksheetsChromosomal Abnormalities
Total questions: 20
Worksheet time: 18mins
A procedure that displays the pairs of chromosomes in a cell is called a ____.
genotype
phenotype
karyotype
linotype
chromotype
Nondisjunction can occur if ____ chromosomes fail to separate during meiosis I.
homologous
heterozygous
sex
autosomal
The most common autosomal trisomy at birth is ____.
cri du chat syndrome
Patau syndrom
Klinefelter syndrom
Down syndrome
Turner Syndrom
Persons with Down syndrome typically have how many copies of chromosome 21?
none
one
two
three
Down syndrome may be detected by ____.
a karyotype from chorionic villi testing
a karyotype from anmiocentesis
a test to detect substances in the maternal blood
all of these
Examples of chromosomal mutations are ____ (select all that apply)
inversion
translocation
deletion
duplication
If a segment of a chromosome is present several times more than normal due to unequal crossing-over, it is called ____.
an inversion.
a translocation.
a delection.
a duplication.
If a segment of a chromosome is turned around 180 degrees, it results in ____.
an inversion.
a translocation.
a delection.
a duplication.
A Barr body is a condensed, inactive X chromosome.
True
False
A person with Turner syndrome has ____ sex chromosome(s).
zero
one
two
three
An egg or ovum has a(n) ____ chromosome.
X
Y
either X or Y
extra X or Y
An sperm has a(n) ____ chromosome.
X
Y
either X or Y
extra X or Y
The sex of a newborn child is determined by the ____.
mother
father
both mother and father
Nondisjunction during spermatogenesis can lead to a sperm with _____. (select all that apply)
no sex chromosome
an X and a Y chromosome
two X chromosomes
two Y chromosomes
A person with Turner syndrome has the following sex chromosomes(s).
X
Y
both X and Y
neither X nor Y
A person with Klinefelter syndrome _____.
is a sterile male
is a sterile female
can be either a sterile male or female
in neutral and neither male nor female
Nondisjunction during oogenesis can lead to an egg with _____. (select all that apply)
two X chromosomes
no X chromosomes
Normally, an individual receives _____ autosomes from each parent.
2
22
44
46
Normally, an individual receives two sex chromosomes from a parent.
True
False
Nondisjunction results in an uneven distribution of chromosomes during cell replication. If nondisjunction occurs during meiosis I, the homologous chromosomes do not separate. If nondisjunction happens in meiosis II, sister chromatids do not separate. If a cell has a diploid number of six (2N = 6) before meiosis, how many chromosomes will be in each of the four daughter cells if one pair of chromosomes experiences nondisjunction during meiosis I?
Two cells will have 6 chromosomes, two cells will have none.
Two cells will have 4 chromosomes, two cells will have 2 chromosomes.
Two cells will have 5 chromosomes, two cells will have 1 chromosome.
All four cells will have 3 chromosomes.
