The document discusses a conflict between X and Y regarding sexual orientation. It outlines several factors that may influence sexual orientation such as genes, brain structure, hormones, and Freudian ideas about birth order. It also provides some conclusions and resources for further reading on the topic.

1. X and Y conflict
(II part)
Ingrida Olendraitė
Molecular biologist
University of Vilnius

2. Outline
Seduction
Genes influence on sexual orientation
Freudian idea
Brain
Conclusions
Resources

3. Seduction
Peacock’s tail
Wolf spiders
Communication

4. Genes influence on sexual orientation
Dean Hamer announcement (1993)
60
50
40
twins gays
30
20
the
10
brother is
0
1 2 also gay

5. “Xq28 – Thanks for the genes mom”

6. Freaudian idea
Sexual orientation correlates with birth order
 1/3

7. Brain
 Missed hormone

8. Conclusions
I’m fundamentally mixed, male with
female, parent with offspring, warring
segments of chromosomes that interlocked in
strife millions of years before the River Severn
ever saw the Celts and Saxons of Housman’s
poem.
(A Shropshire Lad)

9. Resources
Matt Ridley “Genome”
Bonthuis, P.J., et al., X-chromosome dosage
affects male sexual behaviour. Horm. Behav.
(2012), doi: 10.1016/j.yhbeh.2012.02.003
americansfortruth.com
www.elsevier.com/locate/yhbeh
www.hub.servise.com
www.sciencedaily.com