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Mastering Bio 12-15

QuestionAnswer
Nucleoli are present during _____. interphase
Chromosomes become visible during _____. prophase
Centromeres divide and sister chromatids become full-fledged chromosomes during _____. anaphase
Spindle fibers attach to kinetochores during _____. prometaphase
During prophase a homologous pair of chromosomes consists of _____. two chromosomes and four chromatids
During _____ both the contents of the nucleus and the cytoplasm are divided. mitotic phase
In some organisms, such as certain fungi and algae, cells undergo the cell cycle repeatedly without subsequently undergoing cytokinesis. What woul large cells containing many nuclei
Cytochalasin B is a chemical that disrupts microfilament formation. How would this interfere with cell division? cleavage
A plant-derived protein known as colchicine can be used to poison cells by blocking the formation of the spindle. Which of the following would result if colchicine is added to a sample of cells in G2? The chromosomes would coil and shorten but have no spindle to which to attach
Which of the following does not occur during mitosis? replication of the dna
Independent assortment of chromosomes is a result of the random and independent way in which each pair of homologous chromosomes lines up at the metaphase plate during meiosis I.
Which of the following defines a genome? complete set of an organisms genes
What is crossing over? the exchange of homologous portions of nonsister chromatids
If a cell has completed the first meiotic division and is just beginning meiosis II, which of the following is an appropriate description of its contents? It has half the amount of DNA as the cell that began meiosis.
When we see chiasmata under a microscope, that lets us know which of the following has occurred? prophase I
If the DNA content of a diploid cell in the G1 phase of the cell cycle is x, then the DNA content of the same cell at metaphase of meiosis I would be 2x
How many different combinations of maternal and paternal chromosomes can be packaged in gametes made by an organism with a diploid number of 8 (2n = 8)? 16
When constructing a Punnett square, the symbols on the outside of the boxes represent _______, while those inside the boxes represent _______. gametes, progeny
If an organism with the genotype AaBb produces gametes, what proportion of the gametes would be Bb? none
Which of the following differentiates between independent assortment and segregation? The law of independent assortment requires describing two or more genes relative to one another
Mendel's observation of the segregation of alleles in gamete formation has its basis in which of the following phases of cell division? anaphase I of meiosis
Mendel's second law of independent assortment has its basis in which of the following events of meiosis I? alignment of tetrads at the equator
SRY is best described in which of the following ways? a gene region present on the Y chromosome that triggers male development
Which of the following statements is true of linkage? The closer two genes are on a chromosome, the lower the probability that a crossover will occur between them.
What is a nondisjunction? An error in cell division that causes homologous chromosomes or sister chromatids to move to the same side of the dividing cell
What kind of cell results when a diploid and a haploid gamete fuse during fertilization? triploid cell
Of the following chromosomal abnormalities, which type is most likely to be viable in humans? trisomy
If a diploid cell undergoes meiosis and produces two gametes that are normal, and one with n − 1 chromosomes, and one with n + 1 chromosomes, what type of error occurred? A nondisjunction error occurred in meiosis II, in which both sister chromatids of a chromosome migrated to the same pole of the cell.
If a diploid cell undergoes meiosis and produces two gametes with n + 1 chromosomes and two gametes with n− 1 chromosomes, what type of error occurred? A nondisjunction error occurred in meiosis I, in which both members of a homologous pair migrated to the same pole of the cell.
In general, the frequency with which crossing over occurs between two linked genes depends on what? how far apart they are on the chromosome
Created by: akting2001 on 2011-10-23



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