Answer questions 120–124 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?
Answers: 120. e, 121. d, 122. e, 123. c, 124. b
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