Natural Triploidy inCynodon Dactylon(L.) Pers.
نویسندگان
چکیده
منابع مشابه
Occurrence of natural triploidy in Rhamdia quelen (Siluriformes, Heptapteridae).
Five specimens of Rhamdia quelen collected from the Lindóia Stream, PR, Brazil, were cytogenetically analyzed. The diploid chromosome number found was 58, including 30 metacentric, 16 submetacentric, 10 subtelocentric, and 2 acrocentric chromosomes. Supernumerary or B chromosomes, frequently observed in this fish group, were not detected. One of the individuals was triploid, with 3n = 87. A sil...
متن کاملRecurrent triploidy of maternal origin.
We report the occurrence of triploid preimplantation embryos following in vitro fertilization (IVF) and intracytoplasmic sperm injection (ICSI) in a woman with two previously-identified triploid conceptuses which spontaneously underwent fetal demise at 10 and 23 weeks' gestation. An error in maternal meiosis II is proposed as the most likely cause.
متن کاملUniform PERs and Comportment Analysis
Hunt showed that the notion of PER-based strictness properties subsumed the incomparable notions of idealand projection-based properties on non-lifted value spaces. We extend Hunt’s idea so it can encompass other comportment properties (such as totality) by separating the information and fixpoint orderings. We then define a class of uniform PERs (in the sense that they treat non-bottom ground e...
متن کاملTriploidy—Observations in 154 Diandric Cases
Hydatidiform moles (HMs) are abnormal human pregnancies with vesicular chorionic villi, imposing two clinical challenges; miscarriage and a risk of gestational trophoblastic neoplasia (GTN). The parental type of most HMs are either diandric diploid (PP) or diandric triploid (PPM). We consecutively collected 154 triploid or near-triploid samples from conceptuses with vesicular chorionic villi. W...
متن کاملDiploid sperm and the origin of triploidy.
Trisomy 16, the 45,X monosomy and triploidy are the more frequent chromosome anomalies in spontaneous abortions. Earlier estimations, based on frequencies of diandric triploidy at conception, resulted in a good correlation with the frequencies of diploid sperm in infertile males (up to 1.9%). Recent data have shown that most diandric triploids originate by dispermy, although 8.3% of them are pr...
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ژورنال
عنوان ژورنال: Caryologia
سال: 1970
ISSN: 0008-7114,2165-5391
DOI: 10.1080/00087114.1970.10796360