chapter 13 quiz

Question 1

which of the following defines a genome

a:representation of a complete set of a cells’ polypeptides
b:the complete set pf an organisms polypeptides
c:the complete set of a species polypeptides
d:a karyotype
e:the complete set of an organisms genes

Answer 1

the complete set of an organisms genes

Question 2

at which stage of mitosis are chromosomes usually photographed in the preparation of karyotype?

a:prophase
b:metaphase
c:anaphase
d:telophase

Answer 2

metaphase

Question 3

which of the following is true of a species that has a chromosome number 2n=16

a:the species is diploid with 32 chromosomes per cell
b:the species has 16 sets of chromosomes per cell
c:each cell has eight homologous pairs
d:during the s phase of the cell cycle there will 32 separate chromosomes
e: a gamete from this species has four chromosomes

Answer 3

each cell has eight homologous pairs

Question 4

eukaryotic sexual life cycle show tremendous variation. of the following elements, which do all sexual life cycles have in common?

I. Alternation of generation
II. Meiosis
II. Fertilization
IV. Gametes
V. Spores

a:I, IV, V
b: I, II, IV
c: II, III, IV
d:II, IV, V
e: I, II, III, IV, and V

Answer 4

meiosis, fertilization, gametes

Question 5

which of these statements is false

a:in humans each of the 22 maternal autosomes has a homologous paternal chromosome
b:in humans the 23rd, the sex chromosomes, determines whether the person is female (XX) or male (XY)
c:single haploid (n) sets of chromosomes in ovum and sperm unite during fertilization, forming a diploid (2n) single celled zygote
d:at sexual maturity ovaries and testes produce diploid gametes by meiosis
e: sexual life cycles differ with respect to the relative timing of meiosis and fertilization

Answer 5

at sexual maturity ovaries and testes produce diploid gametes by meiosis

Question 6

sister chromatids are separated from each other during

a:metaphase I
b:anaphase I
c:telophase II
d: anaphase II

Answer 6

anaphase II

Question 7

which of the following best describes a karyotype?

a:a pictorial representation of all the genes for a species
b:a display of each of the chromosomes of a single cell
c: the combination of all the maternal and paternal chromosomes of a species
d:the collection of all the chromosomes in an individual organism
e: a photograph of all the cells missing or extra chromosomes

Answer 7

a display of each of the chromosomes of a single cell

Question 8

after telophase I of meiosis, the chromosomal makeup of each daughter cell is

a:diploid, and the chromosomes are each composed of a single chromatid
b: diploid and the chromosomes are each composed of two chromatids
c:haploid, and the chromosomes are each composed of a single chromatid
d:haploid and the chromosomes are each composed of two chromatids
e: tetraploid and the chromosomes are each composed of two chromatids

Answer 8

haploid and the chromosomes are each composed of two chromatids

Question 9

a given organism has 46 chromosomes in its karyotype. we can therefore conclude which of the following?

a: it must be human
b:it must be a primate
c: it must be an animal
d: it must be sexually reproducing
e: it gamete must have 23 chromosomes

Answer 9

it gamete must have 23 chromosomes

Question 10

independent assortment of chromosomes occurs

a: the statement is true mitosis only
b:the statement is true for meiosis I only
c:the statement is true for meiosis II only
d: the statement is true for mitosis and meiosis I
e:the statement is true for mitosis and meiosis II

Answer 10

the statement is true for meiosis I only

Question 11

which of the following occurs in meiosis but not in mitosis

a:chromosome replication
b:synapsis of chromosomes
c:oroduction of daughter cell
d: alignment of chromosomes at the equator
e:condensation of chromatin

Answer 11

synapsis of chromosomes

Question 12

if a diploid organism has a genome consisting of 4 pair chromosomes, it can produce different combinations of maternal and paternal chromosomes (disregarding crossing over)

a:4
b:8
c:12
d:16

Answer 12

16

Question 13

a tetrad includes which of the following sets of dna strands

a:two single-stranded chromosomes that have synapsed
b:two set of sister chromatids that have synapsed
c:four set sister chromatids
d: four set unique chromosomes
e:eight set of sister chromatids

Answer 13

two set of sister chromatids that have synapsed

Question 14

three of the four choices listed below concern cell with two chromosome set. select the exception

a:zygote
b:somatic cells
c:gamete
d: diploid

Answer 14

gamete

Question 15

three of the four choices listed below are characteristic of meiosis. select the exception
a:involves two divisions
b:reduces the number of chromosomes
c:results in producing genetically identical cells
d:produces haploid cells

Answer 15

results in producing genetically identical cells

Question 16

the essence of meiosis is that

a: gametes receive one copy of each member of each pair of homologous chromosomes
b:diploid gametes are formed
c:each gamete receives one member of each pair of homologous chromosomes
d:each gamete receives one member of each pair of homologous chromosomes and haploid gametes are formed

Answer 16

each gamete receives one member of each pair of homologous chromosomes and haploid gametes are formed