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Life, 4/e

Ricki Lewis, University of New York at Albany
Mariëlle Hoefnagels, University of Oklahoma
Douglas Gaffin, University of Oklahoma
Bruce Parker, Utah Valley State College

Chromosomes

Chapter Quiz


1	DNA euchromatin is more loosely constructed and includes areas ____________.
		A)	that encode protein
		B)	near centromeres
		C)	at the tips of chromosomes
		D)	All of these are correct.


2	A chromosome is ______________ if the centromere is located very close to a chromosome tip.
		A)	metacentric
		B)	submetacentric
		C)	acrocentric
		D)	telocentric


3	Genes that reside on the same chromosome are said to be ___________.
		A)	transposable
		B)	satellite genes
		C)	autosomal
		D)	linked


4	True or False. The pea plant traits in Mendel’s crosses were transmitted on different chromosomes.
		A)	True
		B)	False


5	When a dominant allele is linked to a recessive allele, the genes are said to be in _____________.
		A)	coupling
		B)	repulsion
		C)	parallel
		D)	synchrony


6	The farther apart two genes are on a chromosome, the ____________a crossover is to occur between them.
		A)	less likely
		B)	more likely


7	An individual that has two different sex chromosomes is said to be the _______________.
		A)	homogametic sex
		B)	heterogametic sex
		C)	dominant sex
		D)	recessive sex


8	True or False. Human sons receive X-linked traits primarily from their fathers.
		A)	True
		B)	False


9	If a woman has a hemophilia carrier mother and a hemophiliac father, what is the probability of the woman being a hemophiliac?
		A)	25%
		B)	50%
		C)	75%
		D)	100%


10	Calico cats are walking demonstrations of X inactivation because they have ___________.
		A)	orange patches only
		B)	black patches only
		C)	both orange and black patches
		D)	no coloration and are white


11	An inactivated X chromosome in the nucleus of a cell appears as a ___________ in the microscope.
		A)	normal X chromosome
		B)	polyploid
		C)	Barr body
		D)	monosomy


12	Human polyploids are common and often survive for decades.
		A)	True
		B)	False


13	Aneuploidy
		A)	results from nondisjunction.
		B)	occurs when there is an abnormal number of chromosomes.
		C)	generally causes fetuses to stop developing before birth.
		D)	All of these are correct.


14	True or False. Although the likelihood of giving birth to a child with trisomy 21 increases with a woman’s age, 40% of trisomy 21 cases result from nondisjunction in the male.
		A)	True
		B)	False


15	True or False. The severity of Down syndrome cases rarely varies and if so, can be predicted from prenatal examinations.
		A)	True
		B)	False


16	Females with delayed or no sexual development but have normal intelligence most likely suffer from
		A)	Turner syndrome.
		B)	triplo-X
		C)	Klinefelter syndrome
		D)	hormonal abnormalities


17	Consider the following phenotype: tall and thin, menstrual irregularity, slightly lower IQ. With which syndrome are these characterstics consistent?
		A)	trisomy-18
		B)	XXY
		C)	XXX
		D)	XO


18	Individuals having sex chromosomes XXY would have which disorder?
		A)	Turner syndrome
		B)	Marfan syndrome
		C)	Down syndrome
		D)	Klinefelter syndrome


19	True or False. Men with an extra Y chromosome very often are violent and aggressive.
		A)	True
		B)	False


20	What type of smaller-scale chromosome abnormality is involved in the Cri du chat syndrome?
		A)	deletion
		B)	duplication
		C)	inversion
		D)	translocation


21	What type of smaller-scale chromosome abnormality occurs when the short arms of two nonhomologs break and join the two long arms making a new, large chromosome?
		A)	deletion
		B)	duplication
		C)	Robertsonian translocation
		D)	reciprocal translocation


22	True or False. Fragile X syndrome affects human males but not females.
		A)	True
		B)	False

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