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15 Cards in this Set
- Front
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2. Discuss the concepts of homologous chromosome, diploidy,haploidy. What characteristics are share between two chromosomes consider to be homologous?
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homologous chrmsme shre properties: overall lenght,position cetromere(metacentric,submetacentric, acrocentric, telocentric)
homologous not identical but similiar diploidy 2n-both memberss of homologous pair of chromosomes are present humans 46 haploid n-contains one chromosome of each homologous pair of chromosomes human 23 |
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What characteristics are share between two chromosomes consider to be homologous?
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the change from a diploid(2n) to haploid(n) occurs during reduction division whn tetrads become dyads during meiosis I.
refering to # human chrmsme, prmary spermatocyte(2n=46)becomes two secondary spermatocytes each with n=23 |
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interphase
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interphase-intial stage of cell cycle replication of DNA of each chromosome (S-Phase) synth DNA)
-no DNA synthesis occurs before and after interphase GI & GII(G2) interphase-absent visible chromosomes |
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what genetic material is partitioned into daughter cell during nuclear division___________.complex and precise.
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karyokinesis
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what do we call cytoplasmic division?less complex than karyokinesis*
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cytokenesis
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cytoplasmic organelles either replicate themselves, arise from existing membrane structure or are synthesized_______(anew) in each cell.
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de novo
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What is going during G1,G2 and interphase S-phase?
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intesive metabolic activity, cell growth, and cell differentiation
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What happens by the end of G2 cell size?
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the volume of the cell has roughly doudble, DNA is replicated, and Mitosis is intaited
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What is G1 an interesting in study of cell proliferation and its controll?
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cell either withdraws from the cycle or becomes quiescent and enter the G0 STAGE(don't proliferate)
or become committed to initiating DNA synthesis and completing the cycle |
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4) Describe the events that characterize each stage of mitosis?
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interphase_chrmsme extended,uncoiled form chromatin
there are five stages of mitosis* prophase-chrms coil up,shrten,centrioles divide&move apart prometaphase:chrm clrly dble strctre, centrle reach oppste poles,spindle fibers form metaphase:centromere aling on metaphase plate anaphase: centromeres split and daughter chromosomes migrate to opposite poles.motor proteins,daught telophase:daughter chromosomes arrive at the poles, cytokenesis commences plan however form cell plate midle lamell |
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What is mitosis?*
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cell division resulting in the rpoduction of two cells, each with same chromosome and genetic complement as the parent cell
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during anaphase migration is made possible by the binding of spindle fibers to structure associated with centromere of each chromosome called_________. what?
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Kinetochore
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What does spindle fiber consist of ?
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microtubules which further consist of subunits of protien tubilin. grow out of the opposite poles of cell two region containing centriole
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what is refered to each sister chromatids when each sister chrmd dijoin move opposite of the pole(anaphase)?
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daughter chromosomes
motor protien atp propel chromosome daughter to opposite end of cell |
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5# if an organism has diploid # of 16, how many chromatids are visible at the end of mitotic prophase? how many chromosomes are moving to each pole during anaphase of mitosis?
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prophase double the chromoses2n=16-- 32
prophase 32 chromotids are visible anaphase 16 and 16 different poles daughter chromosomes |