Delimitation of the Thermolabile Phenocritical Period of Sex Determination and Differentiation in the Ontogeny of the Normally Hermaphroditic Fish Rivulus marmoratus Poey

In many animals, including us, the genetic sex is determined at fertilization by sex chromosomes. Seemingly, the sex determination (SD) in human and animals is determined by the amount of constitutive heterochromatin on Y chromosome via cell thermoregulation. It is assumed the medulla and cortex tissue cells in the undifferentiated embryonic gonads (UEG) differ in vulnerability to the increase of the intracellular temperature. If the amount of the Y chromosome constitutive heterochromatin is enough for efficient elimination of heat difference between the nucleus and cytoplasm in rapidly growing UEG cells the medulla tissue survives. Otherwise it doomed to degeneration and a cortex tissue will remain in the UEG. Regardless of whether our assumption is true or not, it remains an open question why on Y chromosome there is a large constitutive heterochromatin block? What is its biological meaning? Does it relate to sex determination, sex differentiation and development of secondary sexual characteristics? If so, what is its mechanism: chemical or physical? There is no scientifically sound answer to these questions.

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SEX DETERMINATION OF FETUS PRENATAL FROM MATERNAL PLASMA BY USING DUPLEX PCR TECHNIQUE IN GOAT

Basrah Journal of veterinary Research ◽

10.33762/bvetr.2014.88125 ◽

2014 ◽

Vol 13 (1) ◽

pp. 50-59

Author(s):

A NisreenYasirJasim ◽

Tahir A. Fahid ◽

Talib Ahmed Jaayid

Keyword(s):

Sex Determination ◽

Maternal Plasma ◽

Duplex Pcr

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Study of Significance of Pelvic Brim Chord and Pelvic Brim Depth in Sex Determination of Human Hip Bone

International Journal of Scientific Research ◽

10.15373/22778179/jan2014/132 ◽

2012 ◽

Vol 3 (1) ◽

pp. 384-386

Author(s):

Dr. Sudarshan Gupta ◽

◽

Dr. Bhadresh Vaghela ◽

Dr. Deepak Howale ◽

Dr. Mehul Tandel

Keyword(s):

Sex Determination ◽

Pelvic Brim

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AVALIAÇÃO DO CONHECIMENTO TRADICIONAL DOS PESCADORES DA RDSM APLICADO À IDENTIFICAÇÃO DO SEXO DE PIRARUCUS

Scientific Magazine UAKARI ◽

10.31420/uakari.v5i2.67 ◽

2010 ◽

Vol 5 (2) ◽

pp. 59-66

Author(s):

Kelven Lopes ◽

Helder Lima de Queiroz

Keyword(s):

Sex Determination ◽

Traditional Knowledge ◽

Structured Interviews ◽

Sustainable Fisheries ◽

Arapaima Gigas ◽

Males And Females

This study examined the traditional knowledge of fishermen at Mamirauá Reserve about sex determination of pirarucus, Arapaima gigas Schinz 1822. We evaluated the criteria used for by fishermen in the sector Jarauá at Mamirauá Reserve for this determination, during the fisheries season, from October to November 2004. We analyzed responses of a group of about 15 fishermen collected in structured interviews regarding 109 individual pirarucus, 65 males and 44 females. From this sample, only 64 fish have their sex correctly predicted by the fishermen. Although the traditional knowledge of local fishermen is a key component of the sustainable fisheries of this species, this knowledge is not functional in all ranges and aspects, as in sex distinction. We found that the local fishermen evaluated are not able to recognize the sex of pirarucus, although some criteria applied for this purpose are consistent with their biology. The rates of correct forecasts for recognition of males and females were similar to those obtained by chance, even when the criteria applied were consistent, as the criterion “coloration”, which was significantly consistent for identification of males. Yet the group of fishermen interviewed in this study apparently did not apply this criterion correctly.

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