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A recessive gene is a gene whose effects are masked in the presence of a dominant gene. Every organism that has DNA packed into chromosomes has two alleles, or forms of a gene, for each gene: one inherited from their mother, and one inherited from their father.
People with light eyes tend to carry recessive alleles of the major genes; people with dark eyes tend to carry dominant alleles. In Scandinavia, most people have light eyes—the recessive alleles of these genes are much more common here than the dominant ones.
A recessive gene is a gene that is expressed only when an individual inherits two copies of it, one from each parent. In other words, a recessive gene remains hidden in the presence of a dominant gene.
Recessive, as related to genetics, refers to the relationship between an observed trait and the two inherited versions of a gene related to that trait. Individuals inherit two versions of each gene, known as alleles, from each parent.
Inheritance Example. With respect to eye color, the allele for brown eyes (B) is dominant, and the allele for blue eyes (b) is recessive. If a person receives dominant alleles from both parents (BB) she will have brown eyes. If she receives a dominant allele from one parent and a recessive gene from the other (Bb) she will also have brown eyes.
There are many examples of recessive traits in non-human animals as well. In dogs, traits like yellow fur, white spots, and smooth hair are recessive. In cats, white fur, brown (as opposed to black) fur, and long hair are recessive traits.
A recessive allele is a variety of genetic code that does not create a phenotype if a dominant allele is present. In a dominant/recessive relationship between two alleles, the recessive allele’s effects are masked by the more dramatic effects of the dominant allele.
Are there any examples of dominant and recessive genes in humans? Yes, there are several examples of dominant and recessive genes in humans. One common example is the gene for eye color, where the brown eye color gene (dominant) will overpower the blue eye color gene (recessive) when present.
Recessiveness, in genetics, the failure of one of a pair of genes (alleles) present in an individual to express itself in an observable manner because of the greater influence, or dominance, of its opposite-acting partner.
XR example: hemophilia A- F8 gene at Xq28 (X chromosome, q arm, region 2, band 8) encodes blood clotting factor VIIIc. Without Factor VIIIc, internal and external bleeding can’t be stopped. ... Hemophilia A is recessive because XA / Xa females have normal blood coagulation, while Xa / Xa females have hemophilia. Y-Linked.