What produce variable traits depending on environmental conditions?

What produce variable traits depending on environmental conditions?

Multiple alleles are more than two different forms of the same gene. Polygenic traits are produced by the interaction of several genes (each of which may or may not have multiple alleles.) produce variable traits depending on environmental conditions.

How do multiple alleles differ from polygenic traits?

Multiple alleles are more than two alternative forms of a gene, located at the same loci of homologous chromosomes. In polygenic traits, several genes are involved in determining a single trait. Multiple alleles follow complete dominance or codominance while polygenic traits follow codominance or incomplete dominance./span>

Is skin color multiple alleles?

Like eye color, skin color is an example of polygenic inheritance. The genes that determine skin color have two alleles each and are found on different chromosomes. If we consider only the three genes that are known to influence skin color, each gene has one allele for dark skin color and one for light skin color./span>

Why are my dark brown eyes getting lighter?

As you grow up, the melanin level increases around your pupil, making the eye darker. However, 10-15% of Caucasian eyes change to a lighter color as they age, as pigment in the iris changes or degrades./span>

Can eyes get lighter?

But in a small percentage of adults, eye color can naturally become either noticeably darker or lighter with age. What determines eye color is the pigment melanin. Eyes that have a lot of it in the connective tissue at the front of the iris, called the stroma, are darker, while those that have less tend to be lighter./span>

Why do older people’s eyes turn blue?

This is likely because blood vessels in your eyes become more open with age and allow more cholesterol and other fats to leak into the cornea. About 60 percent of people ages 50 to 60 have this condition. After age 80, almost 100 percent of people will develop this arc around their cornea./span>

What is the GREY ring around my eye?

Arcus senilis is a gray or white arc visible above and below the outer part of the cornea — the clear, domelike covering over the front of the eye. Eventually, the arc may become a complete ring around the colored portion (iris) of your eye. Arcus senilis is common in older adults./span>

What does it mean when you have a blue ring around your eyes?

Blue rings around the iris are caused by cholesterol deposits in the eye. The deposits are actually white or yellowish but can appear blue. This might sound dangerous, but it isn’t. Researchers estimate that this condition impacts anywhere between 20 and 35 percent of people, becoming increasingly likely as you age./span>