| azygos | (adjective) occurring singly; not one of a pair | Synonyms: azygous |
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| azygous | (adjective) occurring singly; not one of a pair | Synonyms: azygos |
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| dizygotic | (adjective) derived from two separately fertilized eggs | Synonyms: dizygous |
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| dizygous | (adjective) derived from two separately fertilized eggs | Synonyms: dizygotic |
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| heterozygosity | (noun) the state of being heterozygous; having two different alleles of the same gene | - |
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| heterozygote | (noun) (genetics) an organism having two different alleles of a particular gene and so giving rise to varying offspring | - |
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| heterozygous | (adjective) having dissimilar alleles at corresponding chromosomal loci | - |
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| homozygosity | (noun) the state of being homozygous; having two identical alleles of the same gene | - |
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| homozygote | (noun) (genetics) an organism having two identical alleles of a particular gene and so breeding true for the particular characteristic | - |
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| homozygous | (adjective) having identical alleles at corresponding chromosomal loci | - |
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| monozygotic | (adjective) derived from a single fertilized egg | - |
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| zygodactyl | (adjective) (of bird feet) having the first and fourth toes directed backward the second and third forward | - |
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| zygoma | (noun) the slender arch formed by the temporal process of the cheekbone that bridges to the zygomatic process of the temporal bone | Synonyms: arcus zygomaticus, zygomatic arch |
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| zygomatic | (adjective) of or relating to the cheek region of the face | - |
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| (noun) the arch of bone beneath the eye that forms the prominence of the cheek | Synonyms: cheekbone, jugal bone, malar, malar bone, os zygomaticum, zygomatic bone |
| zygomorphic | (adjective) capable of division into symmetrical halves by only one longitudinal plane passing through the axis | Synonyms: bilaterally symmetrical, zygomorphous |
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| zygomorphous | (adjective) capable of division into symmetrical halves by only one longitudinal plane passing through the axis | Synonyms: bilaterally symmetrical, zygomorphic |
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| zygospore | (noun) a plant spore formed by two similar sexual cells | - |
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| zygote | (noun) (genetics) the diploid cell resulting from the union of a haploid spermatozoon and ovum (including the organism that develops from that cell) | Synonyms: fertilized ovum |
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| zygotene | (noun) the second stage of the prophase of meiosis | - |
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| zygotic | (adjective) of or relating to a zygote | - |
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