Select the best process listed below for each statement numbered
125129. 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.
Question 2Answer questions 120124 in reference to the five items listed
below.
a. 12
b. 23
c. 24
d. 46
e. 47
D 120. How many chromosomes does each somatic cell
have in a human male who has two X chromosomes?
D 121. Following a gene duplication event involving only
five loci, how many chromosomes will a human
female have?
D 122. How many chromosomes are present in the somatic
cells of a child born with Down syndrome (trisomy
21)?
D 123. How many chromosomes are present in each cell of
the germ cell line for a tetraploid species where its
normal complement of chromosomes is 48?
D 124. The normal sperm cell of species X carries 11
chromosomes. Following nondisjunction in the
formation of secondary spermatocytes and their
subsequent fertilization of normal ova, some of the
zygotes will have 21 chromosomes, others will have
22, and the remainder will have how many
chromosomes?
Quick Reply
