The genetic contribution to a trait is called the genotype. The outward expression of the genotype is called the phenotype.

Gene

Different forms of a gene, which produce variations in a genetically inherited trait. Different alleles produce different hair colors—brown, blond, red, black, etc. Genes are parts of DNA and carry hereditary information passed from parents to children.

If both parents do not have the trait and the child does, it is recessive. If one parent has the trait and the child does or does not, it is dominant.

A few of the most common recessive genes in humans are ones you would think are dominant. But let’s see if we can surprise you a little….The Most Common Recessive Genes In Humans

• Being Tall.
• Type O Blood.
• The Ability To Carry A Tune.
• Not Being Nearsighted.
• Blue Eyes.
• Hairless Hands.
• Straight Hair.
• Colorblindness.

However, when there are two recessive genes, that is, straight hairline alleles, the expression of the trait is a straight hairline….Common Dominant And Recessive Traits.

The brown eye form of the eye color gene (or allele) is dominant, whereas the blue eye allele is recessive. If both parents have brown eyes yet carry the allele for blue eyes, a quarter of the children will have blue eyes, and three quarters will have brown eyes.

If both of you have brown eyes, then there is generally a 25% chance that the baby will have blue eyes if both of you carry the recessive blue-eye gene. But if only one of you has a recessive blue-eye gene, and the other has two brown, dominant genes, then there is a less than 1% chance of the baby having blue eyes.

So, to try and clarify things, let’s think about this situation. Someone with brown eyes may be carrying one blue allele and one brown allele, so a brown-eyed mother and a blue-eyed father could give birth to a blue-eyed child. Now mix in a third green allele, which is dominant to blue, but recessive to brown.

A pigment called melanin is responsible for that color — the same pigment that determines the color of our skin. Green irises have an uncommon melanin level — less than “truly” brown eyes, but more than blue eyes. This is why green eyes are so unique.

One study found that the red hair-green eyes genetic combination is one of the rarest, at -0.14 correlation.

Most Attractive Hair and Eye Color Combinations

• Brown hair and light hazel eyes.
• Red hair and dark blue eyes.
• Brown hair and green eyes.
• Black hair and purple eyes.
• Blond hair and dark brown eyes.
• Brown hair and blue eyes.
• Black hair and green eyes.
• Red hair and green eyes.

The title of rarest hair color/eye color combination belongs to red-haired folks with blue eyes. According to Medical Daily, both blue eyes and red hair are recessive traits, so the likelihood of both traits appearing together is actually pretty slim.

‘It’s extremely rare for people to have hair that is naturally a strawberry blonde color. Basically, strawberry blonde is mostly based on red tones, with blonde highlights dotted here and there. It takes its name from the Italian renaissance.