WorksheetsGenetics Week 2
Total questions: 23
Worksheet time: 12mins
With regard to their chromosomes, what is a major difference between prokaryotes and eukaryotes?
Eukaryotes are diploid while prokaryotes are haploid
Prokaryotes have DNA located in their cytoplasm, while all the DNA in eukaryotic cells is located inside a membrane bound nucleus.
Eukaryotes have linear chromosomes while most prokaryotes contain a single circular chromosome.
Prokaryotes compact their DNA to a high degree while eukaryotes maintain the chromosomes in an uncompacted state.
Which of the following would be a valuable application of a karyotype?
Microscopic analysis could allow identification of unusual cellular structures.
An individual could be matched to a forensic sample based on identical karyotypes.
A specific gene which causes a genetic disorder could be identified.
Genetic disorders caused by chromosomal rearrangements could be diagnosed.
A locus is:
One version of a gene.
The location of a gene along the chromosome.
The character the gene effects.
The mechanism of action of a gene.
Cellular division is important for which of the following processes?
Growth of a multicellular organism.
Growth of a unicellular organism.
Reproduction of a unicellular organism.
All of the above.
A and C only.
Which of the following is a correct description for mitosis?
Cell division of prokaryotic cells.
A sorting mechanism which accompanies cell division in eukaryotic cells.
A mechanism which reduces chromosome number from diploid to haploid during gamete formation.
The process whereby a eukaryotic cell is created from a prokaryote.
What is the major difference between sexual and asexual reproduction?
Sexual reproduction does not require cell division.
Asexual reproduction cannot occur in diploid species.
Asexual reproduction cannot occur in eukaryotes.
Asexual reproduction produces offspring identical to the parent.
What is a restriction point?
A point at which a cell is prevented from proceeding through the cell cycle.
A point at which a cell has become committed to proceeding through the cell cycle to cell division.
A point at which the cell density in a population has become too high and none of the cells are allowed to divide.
None of these.
What change occurs in chromosome structure between G1 and G2 phases of interphase?
By G2, they have become more tightly condensed.
They begin to be more actively transcribed in G2 than G1.
Chromosomes in G2 contain two linear pieces of DNA while those in G1 have only one.
Chromosomes in G2 have a centromere which was not present in G1.
Which of the following pairs of structures has the same amount of DNA?
An unreplicated chromosome and a chromatid.
A replicated chromosome and a sister chromatid.
A replicated chromosome and a bivalent.
An unreplicated chromosome and a bivalent.
All of the above are pairs that have equivalent amounts of DNA.
Which of the following events does not occur during prophase?
Condensation of chromosomes.
Formation of the mitotic spindle.
Duplication of the DNA.
Fragmentation of the nuclear membrane.
Where do the spindle fibers connect to the chromosomes?
To the centromere.
To the kinetochore.
To the centriole.
To the centrosomes.
What is the characteristic feature of metaphase?
The chromosomes are aligned in the middle of the cell.
The chromosomes have been duplicated and consist of sister chromatids.
Kinetochores are connected to kinetochore microtubules.
Sister chromatids have been separated.
Which event(s) create the most critical difference between mitosis and meiosis?
Separation of sister chromatids.
Formation of bivalents and crossing over.
Replication of chromosomes and connection to the spindle.
Formation of the spindle.
During which phase of meiosis are homologous chromosomes separated?
Metaphase I
Metaphase II
Anaphase I
Anaphase II
Which meiotic division more closely resembles mitosis?
Meiosis I
Meiosis II
Both resemble mitosis closely.
Both have significant differences from mitosis.
How are meiosis and gametogenesis linked in plants?
Meiosis produces haploid gametes directly.
Meiosis produces haploid gametes that are then modified by the sporophyte to produce functional gametes
Meiosis produces a haploid cell that divides by mitosis to form a gametophyte, which then produces gametes by mitosis.
They are not linked in any way.
Which structure of the plant becomes the part of an apple that you eat?
The embryo sac.
The ovule.
The ovary.
The megaspore.
During which phase of meiosis does the segregation described by Mendel primarily occur?
Meiosis I
Meiosis II
Segregation occurs equally in meiosis I and meiosis II
Segregation does not occur during meiosis
How might segregation of genes affected by crossing over differ from that of most genes?
It occurs in meiosis I instead of meiosis II.
It occurs in meiosis II instead of meiosis I.
It occurs twice.
It does not occur at all.
Not considering crossing over, what gamete is not possible from the following diploid individual? Listed are alleles of five genes; members of homologues are separated by a comma. Chromosome 1: ABC , abc; Chromosome 2: Qr , qr.
ABCqr
abcqr
ABcqr
abcQr
Which of the following is not a mechanism for sex determination?
The Z-W system.
The X-O system.
The haplo-diploid system.
The parthenogenetic system.
During which phase of meiosis does independent assortment occur?
Metaphase I
Anaphase I
Metaphase II
Anaphase II
You have a white eyed, male fruit fly with vestigial wings and a wild type female known to be heterozygous for both traits. You know that vestigial is located on an autosome. What is the probability that a mating between these two flies will generate a female offspring with vestigial wings and white eyes?
1/16
1/8
1/4
1/2
