| Z lines |
| Dense areas in myoÞbrils that mark the beginning of the sarcomeres. The actin Þlaments of the sarcomeres are anchored in the Z lines. |
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| zebroid |
| A hybrid animal that results from breeding zebras and horses. |
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| zone of differentiation |
| Area in plant roots where recently produced cells develop into different cell types. |
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| zone of elongation |
| Area in plant roots where recently produced cells grow and elongate prior to differentiation. |
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| zone of intolerance |
| The area outside the geographic range where a population is absent; grades into the zone of physiological stress. |
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| zone of physiological stress |
| The area in a population's geographic range where members of population are rare due to physical and biological limiting factors. |
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| zygomycetes |
| One of the division of the fungi, characterized by the production of zygospores; includes the bread molds. |
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| zygospore |
| In fungi, a structure that forms from the diploid zygote created by the fusion of haploid hyphae of different mating types. After a period of dormancy, the zygospore forms sporangia, where meiosis occurs and spores form. |
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| zygote |
| A fertilized egg. A diploid cell resulting from fertilization of an egg by a sperm cell. |
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