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Reading the dominant and recessive traits list, you will know where your widow’s peak, dimple and freckle come from. You will also learn why you have those appearance traits.
Alleles can be categorized as dominant or recessive, where dominant refers to the visible trait, and recessive refers to the one that is not visible morphologically. Dominant alleles are generally denoted by capital letters, whereas recessive alleles are denoted by lowercase letters.
Dominant traits are those traits which are expressed even in the presence of one copy of an allele for a particular trait in the gene. However, recessive traits are those that are expressed only when two copies of an allele are present in the gene. Let us understand this by a simple example.
Freckles, cleft chin and dimples are all examples of a dominant trait. Having almond-shaped eyes is a dominant trait whereas having round eyes is a feature controlled by recessive alleles. The trait of detached earlobes, as opposed to attached earlobes, is dominant. Right-handedness is dominant over left-handedness.
What is the difference between dominant and recessive traits? Dominant traits are always expressed when the connected allele is dominant, even if only one copy of the dominant trait exists. Recessive traits are expressed only if both the connected alleles are recessive.
Identify non-Mendelian inheritance patterns such as incomplete dominance, codominance, recessive lethals, multiple alleles, and sex linkage. The seven characteristics that Mendel evaluated in his pea plants were each expressed as one of two versions, or traits.
Several basic modes of inheritance exist for single-gene disorders: autosomal dominant, autosomal recessive, X-linked dominant, and X-linked recessive. However, not all genetic conditions will follow these patterns, and other rare forms of inheritance such as mitochondrial inheritance exist.