Comparison between tract and nerve

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  Comparison between tract and nerve Nerve Nerve contain bundle of axons (nerve fibers) in the peripheral nervous system (PNS) that transmits signals between the central nervous system (CNS) and other parts of the body. It is the most important part of peripheral nervous system Location: Peripheral nervous system. Structure: Made of axons, connective tissue layers (endoneurium: axon is surrounded by it , perineurium: bundle of axons are surrounded by it, epineurium: whole nerve trunk is surrounded by it), and blood vessels. It gets myelination by Schwann cell   Function: Carries sensory signals to the CNS (afferent) from peripheral part of body or motor signals carry from from the CNS (efferent) to target organs like skeletal muscle, cardiac muscle, smooth muscle or glands Example: Sciatic nerve, median nerve, except optic nerve (though optic nerve is technically part of CNS in develop...
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Easiest difference between meiosis I and Meiosis II

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Difference between meiosis I and meiosis II
Topic
Meiosis I
Meiosis II
Definition
Meiosis I is the first phase of meiotic cell division
Meiosis II is the second  phase of meiotic cell division
Subphases
Prophase I, metaphase I, anaphase I & telophase I
Prophase II, metaphase II, anaphase II & telophase II
Prophase I  of meiosis 
Prophase 1 of Meiosis is defined by five different phases; Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis
There is no subdivisions of prophase II
Synapsis
Pairing of 46 homologous duplicated chromosomes
Absent
Crossing over
Exchange of large segments of DNA
Absent
Alignment
Alignment of 46 homologous duplicated chromosomes at the metaphase plate
Alignment of 23 duplicated chromosomes at the metaphase plate
Disjunction
Separation of 46 homologous duplicated chromosomes from each other
Separation of sister chromatid from 23 duplicated chromosomes to form 23 single chromosomes
Centromere
Centromere do not split
Centromere split
Cell division
Formation of two secondary gametocytes (23 duplicated chromosomes 2N)
Formation of four gametes (23 single chromosomes, 1N)
Number of cell
Two
Four
Duration
Longer
Shorter
Interphase
There is interphase before meiosis I
There is no interphase between meiosis I and meiosis II
Nature
Heterotypic
Homotypic
Chromosome number during starting of meiosis I
46 (each chromosome is duplicated)  
23 (each chromosome is duplicated )
DNA amount at starting of cell division
4n
N: 23 ( a full set of DNA)  
2n
Chromosome number during end of  meiosis I
23  duplicated chromosome  
23 single chromosome
DNA amount at end  of cell division
2n
N

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