Are these evidences scientific?

[nightlord]

i was start researching towards genetics and homosexuality and was wondering that either these claims are scientifically valid or not !

please say why if its a false claim and non valid evidence

thanks

 

"sexually differentiated behaviors are organized during early life by an irreversible action of sex steroids"
http://www.morganclaypool.com/doi/abs/10.4199/C00064ED1V01Y201208DBR008?journalCode=dbr&

"A linkage between DNA markers on the X chromosome and male sexual orientation"
http://science.sciencemag.org/content/261/5119/321.abstract

"Homosexuality may be caused by chemical modifications to DNA"
http://www.sciencemag.org/news/2015/10/homosexuality-may-be-caused-chemical-modifications-dna

"Homosexual orientation in twins: A report on 61 pairs and three triplet sets
These findings are interpreted as supporting the argument for a biological basis in sexual orientation.
supporting the argument for a biological basis in sexual orientation"
http://link.springer.com/article/10.1007/BF01541765

"A difference in hypothalamic structure between heterosexual and homosexual men"
http://science.sciencemag.org/conte...ract?sid=a3ac9da2-15b4-4cd7-9a16-1f08a2fdd62f

“sexual attraction is influenced by genetic factors”, “heritable basis to male and female sexual orientation”, “found genetic influences on female sexual orientation as measured via attractions”
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0021982#pone-0021982-t001

“PET and MRI show differences in cerebral asymmetry and functional connectivity between homo- and heterosexual subjects”
http://www.pnas.org/content/105/27/9403.short

https://en.wikipedia.org/wiki/Xq28
http://science.sciencemag.org/content/285/5429/803.full
http://www.dailymail.co.uk/sciencet...-Scientists-predict-gay-70-cent-accuracy.html

[Strange]

Most of those links are "scientifically valid" in that they appear to be published in reputable scientific journal and so probably represent good science. That does not say whether they are correct or not. You would need to study the entire body of research in the area to see where the evidence leads.

 

The last few links are secondary sources, just reporting on the research that was done.

 

The last is from the Daily Mail and is therefore probably a tissue of lies driven by middle-class xenophobia and misogyny.

[CharonY]

It is also important to identify the context of the specific claims of the researchers. The first quote for example discusses different elements pertaining to sexual orientation and also in the context of rodent models. Also it is part of a colloquium and is rather a discussion and synthesis of the question rather than an actual study in itself.