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单词 meiosis
释义

Definition of meiosis in English:

meiosis

nounPlural meioses mʌɪˈəʊsɪsmaɪˈoʊsəs
mass noun
  • 1Biology
    A type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell, as in the production of gametes and plant spores.

    the sporophytes of green algae form spores only by meiosis
    Compare with mitosis
    count noun no recombinants were observed in over 100 meioses
    Example sentencesExamples
    • In most meioses, every chromosome pair, no matter how small, sustains at least one crossover - a so-called obligate crossover or obligate chiasma.
    • They were able to work with 12 meioses (a three-generational family with four grandparents, two parents, and four children) and seven marker loci.
    • Models for genetic recombination have been proposed to explain the properties of genetic exchange during fungal meiosis.
    • This is evidence that the genes are evolving in a concerted manner, as might be predicted for genes that mispair very frequently in meiosis.
    • My personal hope is that students will have some intuitive understanding of meiosis as the physical basis of genetics.
  • 2

    another term for litotes
    Example sentencesExamples
    • Meiosis, often achieved through a trope of one word, may range from bitter scorn to light derision.

Derivatives

  • meiotic

  • adjective mʌɪˈɒtɪkmeɪˈɑdɪk
    • Males can, therefore, arise spontaneously, as a result of the rare meiotic loss of an X chromosome.
      Example sentencesExamples
      • The absence of chiasmata can readily account for the observed defect in meiotic chromosome segregation.
      • Several models have been proposed to explain the mechanism responsible for meiotic recombination.
      • During the first meiotic division, homologous chromosomes pair and segregate into two cells.
      • Subsequently, one of the two mating-type alleles was lost during mitotic or meiotic divisions.
  • meiotically

  • adverb mʌɪˈɒtɪk(ə)li
    • Systematic disruption of meiotically induced genes and analysis of the resulting sporulation phenotypes has uncovered many genes involved in various aspects of sporulation.
      Example sentencesExamples
      • Germ cells can divide mitotically to replenish germline tissue or meiotically to produce gametes.
      • Crosses that generated three or four meiotically related seeds were selected for analysis.
      • Following selection, haploids produce gametes mitotically and diploids produce gametes meiotically that then enter the random mating pool.
      • Triploids are often phenotypically normal plants but are meiotically unstable and therefore transient.

Origin

Mid 16th century (in sense 2): modern Latin, from Greek meiōsis, from meioun 'lessen', from meiōn 'less'. sense 1 dates from the early 20th century.

Rhymes

apotheosis, chlorosis, cirrhosis, diagnosis, halitosis, hypnosis, kenosis, metempsychosis, misdiagnosis, mononucleosis, myxomatosis, necrosis, neurosis, osmosis, osteoporosis, prognosis, psittacosis, psychosis, sclerosis, symbiosis, thrombosis, toxoplasmosis, trichinosis, tuberculosis
 
 

Definition of meiosis in US English:

meiosis

nounmīˈōsəsmaɪˈoʊsəs
  • 1Biology
    A type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell, as in the production of gametes and plant spores.

    the sporophytes of green algae form spores only by meiosis
    Compare with mitosis
    count noun no recombinants were observed in over 100 meioses
    Example sentencesExamples
    • In most meioses, every chromosome pair, no matter how small, sustains at least one crossover - a so-called obligate crossover or obligate chiasma.
    • They were able to work with 12 meioses (a three-generational family with four grandparents, two parents, and four children) and seven marker loci.
    • My personal hope is that students will have some intuitive understanding of meiosis as the physical basis of genetics.
    • Models for genetic recombination have been proposed to explain the properties of genetic exchange during fungal meiosis.
    • This is evidence that the genes are evolving in a concerted manner, as might be predicted for genes that mispair very frequently in meiosis.
  • 2

    another term for litotes
    Example sentencesExamples
    • Meiosis, often achieved through a trope of one word, may range from bitter scorn to light derision.

Origin

Mid 16th century (in meiosis (sense 2)): modern Latin, from Greek meiōsis, from meioun ‘lessen’, from meiōn ‘less’. meiosis (sense 1) dates from the early 20th century.

 
 
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更新时间:2024/12/23 19:17:47