نتایج جستجو برای: sex chromosome abnormality

تعداد نتایج: 456037  

Journal: :Nature Reviews Genetics 2013

Background: Newborn gender ratio is one of the most important factors in livestock industry. This ratio has affected on economic condition and controls sex-linked genetically transferred diseases. Offspring sex ratio is affected by such various factors. One of these factors is the Y to X bearing sperm ratio in normal semen that is called primary sex ratio, season and individual differences are ...

Journal: :iranian journal of pathology 2010
hossein ayatollahi akbar safaei mohammad vasei

background and objectives: primary amenorrhea is not a disease but a symptom that may result from several quite different causes[nn1] . common hormonal cause of primary amenorrhea includes constitutional delay, hypothalamic –pituitary dysfunction, chronic systemic disease and absent ovarian function. the aim of this study was to estimate the incidence of the chromosomal abnormality referred for...

Journal: :زیست شناسی جانوری تجربی 0

abstract to identify the species, understanding the characteristics of the species, explore the possibility of speciation, mutations in the study population, and many other purposes. in this method for studying colchesin bath, karyotype use for immature worms. after reviewing the slide karyotype of polychaeta (nereis sp.) and observation and analysis of  50  plaque metaphase plate chromosome nu...

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