Rainbows are light from the Sun, separated into its colors. Each color in the rainbow (red, orange, yellow, green, blue, violet) has a different wavelength. Red is the longest, blue the shortest. When we see the Sun at sunrise or sunset, when it is low in the sky, it may appear yellow, orange, or red.
A gene is a stretch of DNA or RNA that determines a certain trait. Genes mutate and can take two or more alternative forms; an allele is one of these forms of a gene. For example, the gene for eye color has several variations (alleles) such as an allele for blue eye color or an allele for brown eyes.An allele is found at a fixed spot on a chromosome. Chromosomes occur in pairs so organisms have two alleles for each gene â one allele in each chromosome in the pair.hese coded chains lead to âtraitsâ in an individual, such as eye color and blood type. A gene is the basic unit of heredity. An allele is a variation of a gene. Genes come in many different forms, or alleles, that lead to the encoding of different RNA chains and, therefore, different traits.
A genetic condition arising when an allele coding for a specific genetic trait or disease is only found on the X-chromosome. If such an allele is recessive, a female (who has two X- chromosomes) doesnât get the trait, but a male (who has only one X- chromosome) does. X-linked traits are carried by mothers and passed to their sons. Y-chromosome(s)