Test Bank For Our Sexuality 13th Edition
Chapter 1-18
which of the following would be her most probable and efficient route to
establishing a line of such plants?
A) Backtrack through her previous experiments to obtain another plant with the same
traits.
B) Breed this plant with another plant with much weaker traits.
C) Clone the plant asexually to produce an identical one.
D) Force the plant to self-pollinate to obtain an identical one.
D - answers
Which of the following descriptions correctly defines a genome?
A) representation of a complete set of a cell polypeptides
B) the complete set of an organism polypeptides
C) a karyotype
D) the complete set of an organism's genes
A – answers
Which of the following is the smallest unit that would contain a complete copy of the
entire
human genome?
A) one human somatic cell
B) one human chromosome
C) all of the DNA of one human
D) one human gene
A – answers
If an organism is diploid and a certain gene found in the organism has 18 known alleles
(variants), then any given organism of that species can/must have which of the
following?
A) at most, 2 alleles for that gene
B) up to 18 chromosomes with that gene
C) up to 18 genes for that trait
D) up to, but not more than, 18 different traits
B – answers
Which of the following is a true statement about sexual versus asexual reproduction?
A) Asexual reproduction, but not sexual reproduction, is characteristic of plants and
fungi.
B) In sexual reproduction, individuals transmit 50% of their genes to each of their
offspring.
C) In asexual reproduction, offspring are produced by fertilization without meiosis.
D) Asexual reproduction produces only haploid offspring.
,B – answers
At which stage of mitosis are chromosomes usually photographed in the preparation of
a
karyotype?
A) prophase
B) metaphase
C) anaphase
D) telophase
B – answers
Which of the following is true of a species that has a chromosome number of 2n = 16?
A) The species has 16 sets of chromosomes per cell.
B) Each cell has eight homologous pairs.
C) During the S phase of the cell cycle there will be 32 separate chromosomes.
D) A gamete from this species has four chromosomes.
C – answers
Eukaryotic sexual life cycles show tremendous variation. Which of the following
elements do
all sexual life cycles have in common?
I. alternation of generations
II. meiosis
III. fertilization
IV. gametes
V. spores
A) I, IV, and V
B) I, II, and IV
C) II, III, and IV
D) II, IV, and V
A – answers
Which of these statements is true?
A) In humans, the 23rd pair, the sex chromosomes, determines whether the person is
female
(XX) or male (XY).
B) Single, haploid (n) sets of chromosomes in ovum and sperm unite during fertilization,
forming a haploid (n), single-celled zygote.
C) At sexual maturity, ovaries and testes produce diploid gametes by meiosis.
D) Sexual life cycles among different types of organisms are identical with respect to the
relative
timing of meiosis and fertilization.
B – answers
Referring to a plant's sexual life cycle, which of the following processes leads directly to
the
, formation of gametes?
A) sporophyte meiosis
B) gametophyte mitosis
C) gametophyte meiosis
D) sporophyte mitosis
A – answers
Which of the following is an example of alternation of generations?
A) A diploid plant (sporophyte) produces, by meiosis, a spore that gives rise to a
multicellular,
haploid pollen grain (gametophyte).
B) A diploid animal produces gametes by meiosis, and the gametes undergo fertilization
to
produce a diploid zygote.
C) A haploid mushroom produces gametes by mitosis, and the gametes undergo
fertilization,
which is immediately followed by meiosis.
D) A diploid cell divides by mitosis to produce two diploid daughter cells, which then
fuse to
produce a tetraploid cell.
D – answers
The human X and Y chromosomes
A) are both present in every somatic cell of males and females alike.
B) are about the same size and have approximately the same number of genes.
C) are almost entirely homologous, despite their different names.
D) include genes that determine an individual's sex.
C – answers
Which of the following describes a karyotype?
A) a natural cellular arrangement of chromosomes in the nucleus
B) a display of all the cell types in an organism
C) organized images of a cell's chromosomes
D) a display of a cell's mitotic stages
A – answers
Which of the following types of cells would be produced by meiosis?
A) a haploid animal cell
B) a diploid animal cell
C) a diploid plant cell
D) a diploid unicellular organism
A – answers
Which of these is a way that the sexual life cycle increases genetic variation in a
species?
A) by allowing crossing over
Chapter 1-18
which of the following would be her most probable and efficient route to
establishing a line of such plants?
A) Backtrack through her previous experiments to obtain another plant with the same
traits.
B) Breed this plant with another plant with much weaker traits.
C) Clone the plant asexually to produce an identical one.
D) Force the plant to self-pollinate to obtain an identical one.
D - answers
Which of the following descriptions correctly defines a genome?
A) representation of a complete set of a cell polypeptides
B) the complete set of an organism polypeptides
C) a karyotype
D) the complete set of an organism's genes
A – answers
Which of the following is the smallest unit that would contain a complete copy of the
entire
human genome?
A) one human somatic cell
B) one human chromosome
C) all of the DNA of one human
D) one human gene
A – answers
If an organism is diploid and a certain gene found in the organism has 18 known alleles
(variants), then any given organism of that species can/must have which of the
following?
A) at most, 2 alleles for that gene
B) up to 18 chromosomes with that gene
C) up to 18 genes for that trait
D) up to, but not more than, 18 different traits
B – answers
Which of the following is a true statement about sexual versus asexual reproduction?
A) Asexual reproduction, but not sexual reproduction, is characteristic of plants and
fungi.
B) In sexual reproduction, individuals transmit 50% of their genes to each of their
offspring.
C) In asexual reproduction, offspring are produced by fertilization without meiosis.
D) Asexual reproduction produces only haploid offspring.
,B – answers
At which stage of mitosis are chromosomes usually photographed in the preparation of
a
karyotype?
A) prophase
B) metaphase
C) anaphase
D) telophase
B – answers
Which of the following is true of a species that has a chromosome number of 2n = 16?
A) The species has 16 sets of chromosomes per cell.
B) Each cell has eight homologous pairs.
C) During the S phase of the cell cycle there will be 32 separate chromosomes.
D) A gamete from this species has four chromosomes.
C – answers
Eukaryotic sexual life cycles show tremendous variation. Which of the following
elements do
all sexual life cycles have in common?
I. alternation of generations
II. meiosis
III. fertilization
IV. gametes
V. spores
A) I, IV, and V
B) I, II, and IV
C) II, III, and IV
D) II, IV, and V
A – answers
Which of these statements is true?
A) In humans, the 23rd pair, the sex chromosomes, determines whether the person is
female
(XX) or male (XY).
B) Single, haploid (n) sets of chromosomes in ovum and sperm unite during fertilization,
forming a haploid (n), single-celled zygote.
C) At sexual maturity, ovaries and testes produce diploid gametes by meiosis.
D) Sexual life cycles among different types of organisms are identical with respect to the
relative
timing of meiosis and fertilization.
B – answers
Referring to a plant's sexual life cycle, which of the following processes leads directly to
the
, formation of gametes?
A) sporophyte meiosis
B) gametophyte mitosis
C) gametophyte meiosis
D) sporophyte mitosis
A – answers
Which of the following is an example of alternation of generations?
A) A diploid plant (sporophyte) produces, by meiosis, a spore that gives rise to a
multicellular,
haploid pollen grain (gametophyte).
B) A diploid animal produces gametes by meiosis, and the gametes undergo fertilization
to
produce a diploid zygote.
C) A haploid mushroom produces gametes by mitosis, and the gametes undergo
fertilization,
which is immediately followed by meiosis.
D) A diploid cell divides by mitosis to produce two diploid daughter cells, which then
fuse to
produce a tetraploid cell.
D – answers
The human X and Y chromosomes
A) are both present in every somatic cell of males and females alike.
B) are about the same size and have approximately the same number of genes.
C) are almost entirely homologous, despite their different names.
D) include genes that determine an individual's sex.
C – answers
Which of the following describes a karyotype?
A) a natural cellular arrangement of chromosomes in the nucleus
B) a display of all the cell types in an organism
C) organized images of a cell's chromosomes
D) a display of a cell's mitotic stages
A – answers
Which of the following types of cells would be produced by meiosis?
A) a haploid animal cell
B) a diploid animal cell
C) a diploid plant cell
D) a diploid unicellular organism
A – answers
Which of these is a way that the sexual life cycle increases genetic variation in a
species?
A) by allowing crossing over
