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If homosexuality is in the genes wouldn't that mean identical twins should be either both gay or both straight?
Wiki User
∙ 16y ago
Yes, that is true--to an extent.
In 1991, a psychiatrist at Boston University and a psychologist at Northwestern (Richard Pillard and Michael Bailey, respectiely) published a scientific study on sexual orientation and twins. Their findings showed that if one identical twin was gay, the other twin had a 50% chance of being gay, too. For fraternal (i.e. not genetically identical) twins, the rate was only 20%. Since identical twins share the same genes (mostly), the 30% difference is thought to be due to a genetic cause. In other words, identical twins are more than two-and-a-half times as likely to both be gay as other siblings are.
In 1993, a National Cancer Institute researcher named Dean Hamber found that brothers who were not twins who were both gay shared a part of the X chromosome (Xq28) more frequently than did gay men whose brothers were not gay. This also implies a strong genetic link to sexual orientation.
The research continues in the biological or genetic source of sexual orientation, but these and other studies are increasingly pointing to at least a biological if not a genetic component to sexual orientation.
Wiki User
∙ 16y ago
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Why are you not geneticly identicel to your parents?
Because you get chromosomes from both parents, therefore you look like both parents, but have only certain traits from either parent. That is why you are not identical to either parent.
How are traits categorized for the offspring?
As traits are dispensed to the offspring they can be either dominant or recessive. A recessive trait is only expressed when two identical alleles exist.
Why does identical twins not have the same weight and Skin colour?
Eye colour is caused by genetics whereas the weight of a person depends on how they life their life (how healthily they eat or how much exercise they do) so it is an environmental variation. Identical twins have the same genes so have the same eye colour.
Twins formed by the fertilization of two ova by two sperm are?
They would be fraternal twins. Identical twins are created when one sperm fertilized one egg, and hat egg then splits in two. Identical twins are always the same gender, while fraternal twins can be either gender, or a mix of the two.
Where is the best knockout spot located?
the best way to ko someone is to hit them either straight down in the nose or with an uppercut to the jaw.
How do you make people get over their homosexuality?
How do you make someone stop being straight? You don't in either case. You accept people for who they are and get on with your life.
If you have a straight son that does drag is this okay?
People tend to think that doing drag and homosexuality are the same, but they are not always. A great many cross-dressing males have been straight, including some famous ones. This contributor does not understand it either, but sees no great harm in it.
What role did homosexuality play in the fall of Rome or Greece?
Homosexuality played no role in the fall of either empire. Enemy empires, corruption and greed were the culprits.
Is repulsion by a male to male homosexuality a biological or psychological response?
It is a societal and psychological. Homosexuality occurs in nature with animals. People's "repulsion" to anything is either personal preference or biased by societal impressions.
Are quadruplets always identical or always fraternal or can they be either?
Quads can be identical, fraternal, or a pair of identical twins. Identical quads are rare- that would require 1 egg divide into 2, and then divide again into two. Most quads are fraternal.
Can enlarged prostate cause very low testosterone?
The enlarged prostate wouldnt regulate the testosterone production in either direction.
Why are you not identical to your parents?
An offspring is not identical to its parents because, an offspring is the product of the fertilization of two different individuals. Only some features are inherited from either parent, thus the offspring is not an identical copy of the parents.
What are daugther cells?
Either of the two identical cells that form when a cell divides.
What is symmetrical balance?
When 2 identical objects are placed on either side of the axis.
How you can use identical in sentence?
EXAMPLE: Another orator who used the senator's identical words. USAGE NOTE Some authorities on usage specify with as the preferred preposition after identical,but either with or to is acceptable.
What is moving?
Moving directly straight either horizontally or vertically. As if walking on a straight line.
What is a genetically identical individual called?
A clone.
