Select the best process listed below for each statement numbered
125–129. Note that you need to know that the sequence of amino
acids directly reflects the sequence of genes that coded for their
placement.
a. an inversion
b. a deletion
c. a gene duplication
d. a translocation
e. an addition
D 125. Homologous sets of genes ABCDEF and aBCdEF
are located on nonhomologous chromosomes.
Crossing over between them is suppressed because
their locations are the result of this.
D 126. Homologous sets of genes ABCDEF and AEDCBF
are located on homologous chromosomes. Crossing
over between them is suppressed because of this.
D 127. A small region of a protein from three species is
sequenced and found to be as follows:species
X is alanine, glycine, glycine, threonine,
alanine
species Y is alanine, glycine, threonine, alanine
species Z is alanine, valine, glycine, threonine,
alanine
The difference in the amino acid sequence of species
Y is most likely due to this.
Chapter 12 Chromosomes and Human Inheritance 127
D 128. A small region of a protein from three species is
sequenced and found to be as follows:species
X is alanine, valine, threonine, alanine
species Y is alanine, glycine, threonine, alanine
species Z is alanine, valine, glycine, threonine,
alanine
The difference in the amino acid sequence of species
Z is most likely due to this.
D 129. The nucleotide sequences of homologous regions of
DNA of two species are AATGCCCCGTTA and
AATGCCCCGCTTA. If this is not the result of a
nucleotide base-pair addition, then it is most likely
the result of this.
Answers: 137. d, 138. a, 139. b, 140. e, 141. b
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