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1

DNA euchromatin is more loosely folded 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)cis
B)trans
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 only from their fathers.
A)True
B)False
9

If a woman has a hemophilia carrier mother and a father who has hemophilia, what is the probability of the woman having hemophilia?
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 rarely varies and if so, can be predicted from prenatal examinations.
A)True
B)False
16

Females with delayed or no sexual development but who 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)trisomy18
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 causes 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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