genetics quiz 7
A cell contains 18 pairs of chromosomes immediately after completion of mitotic cytokinesis. How many chromatids were present in metaphase? 9 18 27 36 72
e
In an animal with 2n = 24, what is the total number of chromatids present at prophase I of meiosis? 12 24 48 96 none of these choices
c
Assume the amount of DNA in a cell immediately following mitotic cytokinesis is C. The amount of DNA during G1 of interphase would be C. 2C 4C C/2 C/4
a
Chiasmata are formed during Prophase I Metaphase I Anaphase I Prophase II Anaphase II
a
Crossing over involves the genetic exchange between non-sister chromatids of homologous chromosomes non-sister chromatids of non-homologous chromosomes sister chromatids of homologous chromosomes sister chromatids of non-homologous chromosomes
a
Meiosis I is called the reductional division. equational division. multiplicational division. recombinational division. "no name" division.
a
The newly-discovered organism Yawle nhoj, has a diploid chromosome number of 56. How many bivalents and tetrads would be expected to form during meiosis? 28 and 28, respectively 56 and 28, respectively 56 and 56, respectively 112 and 56, respectively none of these choices
a
A meiotic cell cycle consists of _____ cell division(s) and ____ DNA replication(s). 1 ; 1 2 ; 1 2 ; 2 4 ; 2 4 ; 1
b
Homologous chromosomes separate during anaphase of mitosis anaphase I of meiosis anaphase II of meiosis two of the above none of the above
b
In a particular animal, lung cells have 32 pairs of chromosomes. How many chromosomes does a sperm cell contain? 64 32 16 8 4
b
In humans, how many chromosomes are present in metaphase II of meiosis? 2 23 46 92
b
In humans, how many tetrads are present in metaphase I of meiosis? 2 23 46 92
b
The DNA in G1 is found as chromosomes. chromatin. chromatids. chromamia.
b
The G0 phase occurs before G1. between G1 and S. between S and G2. between G2 and M. in prophase.
b
The events of meiosis II are most similar to meiosis I mitosis interphase interkinesis
b
The housefly, Musca domestica, has 2n =12. A fly would have _____ chromosomes in metaphase of mitosis; ________ sister chromatids in metaphase I meiosis and ________ chromosomes in prophase II of meiosis. 24; 24; 12 12; 24; 6 12; 12; 12 24; 12; 6 12; 12; 6
b
What is the correct order for the stages of the cell cycle? G1-G2-M-S G1-S-G2-M M-G1-G2-S G1-M-G2-S G1-G2-S-M
b
Which of the following best describes the chromosomal composition of a daughter cell immediately following telophase I of meiosis? haploid, and each chromosome consists of a single chromatid haploid, and each chromosome consists of two chromatids diploid, and each chromosome consists of a single chromatid diploid, and each chromosome consists of two chromatids none of the above
b
Consider a diploid organism that has 3 pairs of chromosomes. Assuming no crossing-over occurs, what proportion of gametes would be expected to contain chromosomes of maternal origin only? 1/4 1/2 1/8 1/16 none of these choices
c
Consider a diploid organism that has 3 pairs of chromosomes. Assuming no crossing-over occurs, what proportion of gametes would be expected to contain some chromosomes from both paternal and maternal origin? 1/4 1/2 3/4 5/8 none of these wonderful choices
c
Drosophila melanogaster has 2n = 8. How many bivalents are present in prophase I of meiosis? 1 2 4 8 16
c
In mitosis, chromosomes consist of two chromatids from G1 of interphase through metaphase. G1 of interphase through anaphase. G2 of interphase through metaphase. G2 of interphase through anaphase. S of interphase through prophase.
c
Mendel's second law (independent assortment) can be explained by the separation of chromatids during anaphase II of meiosis the crossing over between homologous chromosomes during prophase I of meiosis the random arrangement of homologous chromosomes at metaphase I of meiosis the random arrangement of genes on a chromosome the separation of chromatids during anaphase of mitosis
c
The organism Sllub adirolfhtuos has 16 pairs of long chromosomes, whereas the organism Scub yabapmat has 20 pairs of short chromosomes. The expected chromosome number in somatic tissues of a hybrid between these two organisms is 18 28 36 56 72
c
The spindle fibers are attached to the centromere at the chromatin aster kinetochore telomere centriole
c
The synaptonemal complex is the nucleoprotein complex that makes up a chromosome makes up the spindle fibers holds homologous chromosomes together during meiosis holds sister chromatids together during meiosis
c
Which of the following terms is NOT used to describe the position of the centromere in eukaryotic chromosomes? submetacentric telocentric anticentric metacentric
c
A cell contains 20 chromosomes immediately after completion of telophase of meiosis II. How many chromatids were present in metaphase I? 10 20 40 80 none of these choices
d
A locus is an alternative form of a gene. the point of formation of spindle fibers. the point of attachment of spindle fibers. the position of a gene on a chromosome. the position of a chromosome during metaphase.
d
Immediately following anaphase of mitosis, a cell would have half as many chromosomes as it did before anaphase. half as much DNA as it did before anaphase. twice as many chromosomes as it did before anaphase. twice as much DNA as it did before anaphase. both C and D
d
In a plant with 2n = 40, what is the total number of chromatids present at prophase of mitosis? 10 20 40 80 none of these choices
d
Mitosis is used for asexual reproduction in unicellular organisms growth and repair in multicellular organisms production of gametes in multicellular organisms two of the above all of the above
d
The end results of meiosis is the formation of two genetically identical cells. two genetically different cells. four genetically identical cells. four genetically different cells.
d
The long and short arm of a chromosome are called x and y, respectively y and x, respectively p and q, respectively q and p, respectively tally and tiny, respectively
d
When do the sister chromatids separate during meiosis? in metaphase I in anaphase I in metaphase II in anaphase II the sister chromatids separate in mitosis but not meiosis
d
Which of the following events occurs in meiosis but NOT mitosis? chromatid formation spindle formation chromosome condensation chromosome pairing chromosome movement to poles
d
An acrocentric chromosome has a p and a q arm that are equal in size two centromeres no centromeres a p arm that is larger than the q arm in size none of these choices
e
In a human, how many different types of gametes are possible? Assume no crossing-over. 23 46 2 x 23 23 x 23 2^23
e
The five sub-stages of prophase I are, in order, diplonema, zygonema, pachynema, leptonema, diakinesis leptonema, pachynema, zygonema, diplonema, diakinesis leptonema, zygonema, pachynema, diakinesis, diplonema zygonema, diplonema, pachynema, leptonema, diakinesis leptonema, zygonema, pachynema, diplonema, diakinesis
e
The newly-discovered organism Yawle nhoj, has a diploid chromosome number of 56. Suppose that one of the chromosome pairs fails to disjoin properly during Meiosis I. How many chromosomes will be present in each of the four gametes that result from that meiosis? Assume meiosis II is normal. 12, 12, 16, 16 12, 16, 14, 14 28, 28, 0, 0 28, 0, 14, 14 none of the above
e