共查询到20条相似文献,搜索用时 46 毫秒
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通过对260名(男113人,女147人)信阳农林学院大二学生的眼脸、卷舌、耳垂、美人尖、拇指弯曲、食指长度等8对遗传性状进行调查,结果发现眼睑、耳垂、美人尖、拇指弯曲、食指长度和酒窝6对人类遗传性状隐性基因频率较显性基因频率高,卷舌和双手嵌合的2对遗传性状的显性基因频率较隐性基因频率高。调查群体中女生与男生在眼脸、耳垂、卷舌、美人尖、拇指弯曲、食指长度、和酒窝7对遗传性状中显性和隐性性状出现率之比与女生和男生总人数之比1∶1.3相近。260人中随机抽样调查38人的指纹类型情况结果显示:弓、箕、斗3种指纹出现的比例分别为12.63%,48.68%,38.68%,斗型纹指纹类型人数较多。人均总指嵴数为144.77,男生总指嵴数平均值约为142.59,女生总指嵴数平均值约为146.95。 相似文献
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贵州仁怀苗族头面部体质人类学研究 总被引:1,自引:0,他引:1
对世居在贵州仁怀后山乡的378名(男196人, 女182人)年龄在21-60岁的苗族进行头面部活体观察和测量(观察项目6项, 测量项目16项)。结果表明, 仁怀苗族男女眼裂倾斜度水平、上眼睑有皱褶、睫毛长者占多数; 鼻尖类型钩型与直型出现率接近; 舌运动类型非卷型略占优势;前额发际男性尖型多于平型、女性平型稍多于尖型。头型以特圆、高、阔头型多见;面型以超狭面型为主; 属中鼻型。与我国南方其他5个苗族以及贵州其他族群的聚类分析显示, 仁怀后山乡苗族男性与贵州王卡苗族、贵州布依族男性最为接近, 女性与湖南苗族女性最为接近。 相似文献
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新疆四个民族八对遗传性状的基因频率 总被引:15,自引:1,他引:14
阿不都拉·巴克 依米提·热合曼 木合塔尔·阿不都克里木 哈斯亚提 吾甫尔·依明 阿帕尔·吾甫尔 阿帕尔·加帕尔 米娜瓦尔 吾期库阿依 拉孜古力 热孜亚Abdula Bakhy Imit Rahman Muhtar Abdukerim Hasiyat Gupur Imin Gapar Gupur Gapar Japar Munawar Uqkunay Razigul Raziya 《遗传》1997,19(5):27-29
在调查新疆维吾尔、哈萨克、柯尔克孜、塔吉克族8对遗传性状的基础上分别计算出8对遗传性状在上述4个民族中的基因频率, 并进行了4个民族之间基因频率的比较。比较结果表明:塔吉克与其他3个民族之间基因频率的差异显著,而哈族与柯族之间的差异不显著。
Abstract:Acoording to the investigation of eight pairs of genetic traits among four minorities in Xinjiang (Uygur,Kazak,Kirgiz and Tajik),the gene frequencies of these traits were respectively calculated and compared.The results indicated that the difference of gene frequencies between Tajik and other three populations significant,while it is insignificant between kazak and Kirgiz. 相似文献
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通过对6种藓类植物,即褶叶青藓(Brachythecium salebrosum(Web.et Mohr.)B.S.G.)、湿地匐灯藓(Plagiomnium acutum(Lindb.)Kop.)、侧枝匐灯藓(Plagiomnium maximoviczii(Lindb.)Kop.)、大凤尾藓(Fissidensnobilis Griff.)、大羽藓(Thuidium cymbifolium(Doz.et Molk.)B.S.G.)和大灰藓(Hypnum plumaeforme Wils.)嫩茎和老茎的石蜡切片和显微观察发现,同一藓类植株的嫩茎和老茎,茎结构稳定,不同种藓类植物茎横切面具有不同特征.植物体茎横切面形状、表层细胞的层数、细胞大小和细胞壁厚薄、皮层细胞大小和形状、中轴的有无以及比例等特征可以作为藓类植物的分科分类依据之一. 相似文献
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In experiments on Black Sea skates (Raja clavata), the potential of the receptor epithelium of the ampullae of Lorenzini and spike activity of single nerve fibers connected to them were investigated during electrical and temperature stimulation. Usually the potential within the canal was between 0 and –2 mV, and the input resistance of the ampulla 250–400 k. Heating of the region of the receptor epithelium was accompanied by a negative wave of potential, an increase in input resistance, and inhibition of spike activity. With worsening of the animal's condition the transepithelial potential became positive (up to +10 mV) but the input resistance of the ampulla during stimulation with a positive current was nonlinear in some cases: a regenerative spike of positive polarity appeared in the channel. During heating, the spike response was sometimes reversed in sign. It is suggested that fluctuations of the transepithelial potential and spike responses to temperature stimulation reflect changes in the potential difference on the basal membrane of the receptor cells, which is described by a relationship of the Nernst's or Goldman's equation type.I. P. Pavlov Institute of Physiology, Academy of Sciences of the USSR, Leningrad. I. M. Sechenov, Institute of Evolutionary Physiology and Biochemistry, Academy of Sciences of the USSR, Leningrad. Pacific Institute of Oceanology, Far Eastern Scientific Center, Academy of Sciences of the USSR, Vladivostok. Translated from Neirofiziologiya, Vol. 12, No. 1, pp. 67–74, January–February, 1980. 相似文献
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