Genes, via their influences on morphology and physiology, create a framework within which the environment acts to shape the behavior of an individual animal. The environment can affect morphological and physiological development; in turn behavior develops as a result of that animal’s shape and internal workings.

Most traits are determined by more than one gene. For example, skin color and height are determined by many genes….

• Interlocking fingers. Interlock fingers.
• Ear lobes.
• Widow’s peak.
• Tongue curling.
• Hitch hiker’s thumb.
• Pigmented iris.
• PTC tasting.

While a few traits are due to only one gene (and its alleles), most human genetic traits are the product of interactions between several genes.

In fact, most common vision problems can be attributed to genetics. If a person has two near-sighted parents, there is a 1 in 3 chance that they will develop myopia.

Vision problems from myopia can be corrected by prescription eyeglasses and contact lenses. When short sightedness stabilises (generally, in one’s early twenties), LASIK and other laser eye surgery are good options to correct myopia.

If you have a visual acuity of 20/200 or worse (after putting corrective lenses on), you are considered legally blind. If the glasses or contacts improve your visual acuity, you are not legally blind. A visual acuity of -4.00 is roughly equivalent to 20/400 vision.

The researchers show that blue-eyed men find blue-eyed women most attractive. The laws of genetics state that eye color is inherited as follows: If both parents have blue eyes, the children will have blue eyes. The brown eye form of the eye color gene (or allele) is dominant, whereas the blue eye allele is recessive.

Because the two genes depend on each other, it is possible for someone to actually be a carrier of a dominant trait like brown eyes. And if two blue eyed parents are carriers, then they can have a brown eyed child.

Green is dominant over blue. Green eyes can be GG, or Gb, while blue eyes are bb.

brown