Book Review Chapter 13

Question 1

X-linked recessive traits in humans (or in Drosophila) are observed ________.
in more males than females
in more females than males
in males and females equally
in different distributions depending on the trait

Answer 1

in more males than females

Question 2

The first suggestion that chromosomes may physically exchange segments came from the microscopic identification of ________.
synapsis
sister chromatids
chiasmata
alleles

Answer 2

chiasmata

Question 3

Which recombination frequency corresponds to independent assortment and the absence of linkage?
0
0.25
0.50
0.75

Answer 3

.50

Question 4

Which recombination frequency corresponds to perfect linkage and violates the law of independent assortment?
0
0.25
0.50
0.75

Answer 4

0

Question 5

Which of the following codes describes position 12 on the long arm of chromosome 13?
13p12
13q12
12p13
12q13

Answer 5

13q12

Question 6

In agriculture, polyploid crops (like coffee, strawberries, or bananas) tend to produce ________.
more uniformity
more variety
larger yields
smaller yields

Answer 6

larger yeilds

Question 7

Assume a pericentric inversion occurred in one of two homologs prior to meiosis. The other homolog remains normal. During meiosis, what structure—if any—would these homologs assume in order to pair accurately along their lengths?
V formation
cruciform
loop
pairing would not be possible

Answer 7

loop

Question 8

The genotype XXY corresponds to
Klinefelter syndrome
Turner syndrome
Triplo-X
Jacob syndrome

Answer 8

Klinefelter Syndrome

Question 9

Abnormalities in the number of X chromosomes tends to have milder phenotypic effects than the same abnormalities in autosomes because of ________.
deletions
nonhomologous recombination
synapsis
X inactivation

Answer 9

x-inactivation

Question 10

By definition, a pericentric inversion includes the ________.
centromere
chiasma
telomere
synapse

Answer 10

centromere