QUIZ 2

Question 1

All of the following occur during mitosis
except the

synthesis of DNA

DURING MITOSIS
-chromosomes condense
-uncoupling of chromatids at the centromere
-spindle forms

Question 2

If a cell has 8 chromosomes at metaphase
of mitosis, how many chromosomes will it
have during anaphase?

Answer 2

16

Question 3

Cytokinesis usually, but not always, follows
mitosis. If a cell completed mitosis but not
cytokinesis, the result would be a cell with

Answer 3

two nuclei

Question 4

During which phases of mitosis are
chromosomes composed of two chromatids?

Answer 4

from G2 of interphase to metaphase

Question 5

Cells that are in a nondividing state are in
which phase?

Answer 5

Gο

Question 6

Proteins that are involved in the regulation
of the cell cycle, and that show fluctuations
in concentration during the cell cycle, are
called

Answer 6

cyclins

Question 7

Chromosomes become visible during

Answer 7

prophase

Question 8

Vinblastine is a standard chemotherapeutic drug used to treat cancer.
Because it interferes with the assembly of
microtubules, its effectiveness must be
related to

Answer 8

disruption of mitotic spindle
formation

Question 9

A particular cell has half as much DNA as
some of the other cells in a mitotically active tissue. The cell in question is most likely in

Answer 9

G1

Question 10

a replicated chromosome

Answer 10

CHROMATID

Question 11

Centromeres uncouple, sister chromatids
are separated, and the two new
chromosomes move to the opposite poles of the cell at

Answer 11

anaphase

Question 12

A cell containing 92 chromatids at
metaphase of mitosis would, at its
completion, produce two nuclei containing
how many chromosomes?

Answer 12

46

Question 13

In oogenesis, the sequence of the
development of an egg is

Answer 13

oogonium
primary oocyte
secondary oocyte
ootid
ovum

Question 14

Which of the following terms belongs
with the words: synapsis, tetrads, and
chiasmata?

Answer 14

CROSSING OVER

Question 15

Which of the following happens at the
conclusion of meiosis I?

a. homologous
chromosomes are separated
b. chromosome number conserved
c. sister chromatids separated

Answer 15

a. homologous
chromosomes are separated

Question 16

A plant has four pairs of chromosomes
designated as: AA, BB, CC, and DD. If this
plant is self-fertilized, what chromosome
complement would be found in the roots of
the offspring?

Answer 16

AA BB CC DD

Question 17

When comparing prophase I of meiosis
with prophase of mitosis, which of the ff.
occurs only in meiosis?

Answer 17

tetrads form

Question 18

a result of the random
distribution of the sister chromatids to the
two daughter cells during anaphase II.

Answer 18

Independent assortment of
chromosomes

Question 19

When pairs of homologous chromosomes
separate during anaphase I,

Answer 19

the sister chromatids remain linked to one another

Question 20

undergo the first meiotic division in the production of sperm

Answer 20

primary spermatocytes

Question 21

A cross between homozygous purple-flowered and homozygous white-flowered
pea plants results in offspring with purple
flowers. This demonstrates

Answer 21

dominance

Question 22

I know that black coat color in mice is
dominant to albino. Black mice get a higher
price at the pet store so I am disappointed
when I cross a black mouse with an albino
mouse and get 6 albino and 2 black mice in
the litter. I expected all black. What mistake
did I make?

Answer 22

I assumed that my black mouse
was true-breeding.

Question 23

If non-disjunction occurs during meiosis,
then

Answer 23

a gamete may obtain more than one
homologue

Question 24

If nondisjunction occurs in meiosis II
during gametogenesis, what will be the result at the completion of meiosis?

Answer 24

One gamete will be n + 1
one will be n – 1
and two will be n

Question 25

If a pair of homologous chromosomes fails to separate during anaphase of meiosis I, what will be the chromosome number of the four resulting gametes with respect to the normal haploid number (n)?

Answer 25

n + 1; n + 1; n – 1; n - 1

Question 26

The terms trisomic, monosomic, and aneuploid all refer to chromosomal abnormalities involving an abnormal number of chromosomes. Trisomic refers to the presence of an extra chromosome monosomic refers to the absence of one chromosome, aneuploid refers to any abnormal number of chromosomes. BUT triploid refers to a condition where an organism or cell line has three sets of haploid (single) chromosomes, which is not directly related to the presence of an abnormal number of chromosomes.

Question 27

Of the ff. human trisomy, the one that generally has the most severe impact on the health of the individual is

Answer 27

trisomy 21

Question 28

A human individual is phenotypically female, but her interphase somatic nuclei do not show the presence of Barr bodies (normally present in female). Which of the following statements concerning her is true?

Answer 28

She has Turner syndrome Turner syndrome is a chromosomal disorder characterized by the complete or partial monosomy of the X chromosome in females (45, X) In individuals with Turner syndrome, one of the X chromosomes is either missing

Question 29

Blue diaper syndrome is a rare inborn error of human metabolism. Certain amino acids are not absorbed in the small intestine and are excreted, causing a blue color in the feces. A normal individual married an affected person but all their children are normal, what are the genotypes of the couple?

Answer 29

AA x aa

Question 30

If a purple pea flower is test crossed and produces at least 1 white flower (purple is dominant than white), what is the genotype of the purple pea flower?

Answer 30

Pp

Question 31

In cattle, the polled (hornless) condition is due to a dominant gene, while its recessive allele causes horns to appear. What is the chance of getting polled calf from the cross between two non-polled cattle?

Answer 31

0

Question 32

True or false. All of the cells within an individual are genetically identical.

Answer 32

true

Question 33

t or f: Trisomy 21 is hereditary.

Answer 33

false

Question 34

. True or false. Sex limited inheritance refers to traits that are located on the X or Y chromosome.

Answer 34

false Sex limited inheritance refers to traits that are visible only within one sex, but are determined by genes located on autosomes (non-sex chromosomes)

Question 35

A cell missing both copies of the chromosome

Answer 35

nullisomic

Question 36

An individual made up several genetic lineage

Answer 36

mosaics or chimeras

Question 37

organisms which receive a set or multiple sets of chromosomes from other species

Answer 37

Allopolyploid

Question 38

A better option to detect fetal chromosomal anomalies at an early stage of pregnancy

Answer 38

Chorionic villus sampling

Question 39

The principle which states that a diploid individual organism possesses two alleles encoding a trait and that these two alleles separate in an equal proportion when gametes are formed

Answer 39

Segregation

Question 40

Expresses the likelihood of the occurrence of a particular event

Answer 40

probability

Question 41

The period between mitotic division cycles

Answer 41

interphase

Question 42

The primordial egg cell

Answer 42

oogonium

Question 43

The cytological structure on paired chromosomes with which genetic exchange (crossing over) is correlated

Answer 43

chiasma

Question 44

Pairing of homologous chromosomes begins in this phase

Answer 44

zygotene

Question 45

An organism has a diploid number of 8 in a primary oocyte. a. How many tetrads are present in prophase I? b. How many dyads are present in prophase II? c. How many monads migrate to each pole during anaphase II?

Answer 45

4 TANAN A tetrad is a group of four chromatids that forms during the prophase I stage of meiosis when homologous chromosomes pair up and exchange genetic material through a process called crossing over Dyads are pairs of sister chromatids that form after the separation of homologous chromosomes during the first meiotic division A monad is a single chromatid that is produced when the sister chromatids of a dyad are separated during the second meiotic division