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Exam 3 iClicker Questions

Terms in this set (22)

Chromosomes are primarily made up of:
Lipids
Interphase is part of Mitosis. True or False?
False
Mitosis can happen without interphase. True or False?
False
Which cell has the most DNA?
Neither, they have similar DNA.
The meiosis process resembles mitosis but goes through two rounds of division: Meiosis I and Meiosis II. True or False?
True
Four haploid cells are produced during ____________.
Meiosis II
Crossing over increases genetic variation through genetic recombination during which phase?
Phrophase I
A hypothetical organism is found that contains sex cells that don't undergo meiosis. Instead, sex cells are produced by mitosis. These ghametes then fuse during sexual reproduction. What would be the outcome of this process?
Ploidy in offspring would be doubled the parental ploidy in each generation.
In pea plants, smooth seeds (S) are dominant yo wrinkled seeds(s). In a genetic cross of two plants that re heterozygous for the seed shape trait, the Punnet square to the right. What i the missing genotype?
ss
Mendel had no notion of the physical basics of these "particles". What would those particles turn out to be?
Genes
Down syndrome, also called trisomy 21, is characterized by three copies of chromosome 21. Tristomy 21 can be caused by
Nondisjunction in meiosis
If you were to think of the cell as a car, and mitosis as a process that drives that car to go, what would be a good analogy for a cell that has a mutation in both copies of a tumor-suppressor gene?
The brake pedal of a car does not work at all.
Describe the sequence of mitosis cell cycle for one pair of chromosomes that is undergoing normal mitotic division.
Prophase-metaphase-anaphase-cytokinesis
A somatic cell from a corn plant normally contains 20 chromosomes. How many sister chromatids would that cell contain during G2 of the cell cycle?
40
A somatic cell from a corn plant normally contains 20 chromosomes. After mitosis followed by cytokenisis each new daughter cell will have now how many sister chromatids?
0
Which best explains the process of meiosis?
The cells that result from meiosis I are haploid, and each chromosome consists of 2 chromatids.
cells enter meiosis after going through an S-phase of their life cycle, so the chromosomes have been duplicated. To produce reproductive cells, however, the number needs to be cut in half. How does meiosis accomplish this goal?
Chromosome number is halved during meiosis I when the homologous chromosomes separate, but the sister chromatids remain connected.
You are conducting a genetic screen using Caenothabditis elegans embryos to isolate mutations affecting anaphase(A). Therefore, you need to look for embryos in which
The sister chromatids are not pulled toward the poles.
A life cycle that regularly alternates between haploid and diploid stages is found in all of the following EXCEPT
The bacterium E. coli
All of the following increase genetic variation except
Mitosis
You are given a plant of unknown genotype b it expressing the dominant phenotype. How would you identify your new plant's genotype in the smallest amount of breeding?
Preform multiple test crosses with a known recessive homozygous organism for your selected phenotype.
In watermelon, the gene or green color is dominant over its alleles for stripped color. At another gene locus, the gene for short shape is dominant over its alleles for long shape. These two allele pairs assort independently. If a plant with long, stripped fruit is crossed with a plant that is heterozygous for both of these traits, what percentage of the offspring do you expect will be short and green?
???
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