What is the function of histone proteins?
A. organize DNA in eukaryotic chromosomes
B. connect chromosomes to the mitotic
spindle
C. organize the microtubules that make up
the spindle
D. attach sister chromatids together
A
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Suppose that in studies of genes on the same chromosome you find the following recombination frequencies: Why is the total distance between a and b less than the distance between a and c plus the distance between c and b?
a. a and b are not linked b. the distances were calculated incorrectly c. b is in between genes a and c d. double crossovers between a and b decrease recombinants e. all three genes encode the same trait
Organisms such as lizards that need to maintain body temperature through external means do so by
A. shivering to produce heat. B. sunbathing. C. swimming in geothermal pools. D. running frequently to warm up. E. eating large meals to provide calories for heat production.
Recombination occurs
a. during prophase I and II and involves swapping of chromosome fragments between all 4 chromatids. b. only during prophase I and involves swapping of chromosome fragments between homologous chromatids. c. only during prophase I and involves swapping of chromosome fragments between sister chromatids. d. during prophase I and II and involves swapping of chromosome fragments between sister chromatids. e. during prophase I, prophase II, and prometaphase; it involves exchange of alleles between homologous chromosomes.
Suppose a cell lacks functional Shugoshin. What is the predicted effect on cohesin?
A) Cohesin will be cleaved prior to metaphase in mitosis. B) Cohesin will not be cleaved during mitosis or meiosis. C) Cohesin at the centromeres of sister chromatids will be cleaved during meiosis I. D) Cohesin on the arms of sister chromatids will be cleaved during meiosis II. E) Cohesin will be cleaved normally during mitosis and meiosis I.