discussion: dominant and recessive allele

DISCUSSION
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Discussion
To begin with, dominant is an allele that is usually expressed in an individual who is heterogeneous. Recessive allele on the other hand is that trait that is only expressed in a homozygous situation. In Dominant allele, single copy of a gene is sufficient to express its character, and it is usually denoted by the capital letter. With recessive allele, it requires two copies of the gene to express its character, and it is usually denoted by small letters. If a mom for instance is Aa, and a dad is aa, we see that here the A is dominant. What this portends for their offspring is that it will have 50 percent chances of taking up all the characteristics of A. In the case of a dominant allele, what is needed for that characteristic to manifest is one allele, however, for the recessive, both parents have to contribute the recessive allele for the trait to be manifested in the offspring (Clark, et al., 2003).
An autosomal trait is that trait that is passed on to an offspring via genes, it, however, does not determine the sex of that individual. The opposite of that would be sex-lined traits which are likewise inherited through genes though these ones do determine the sex of an individual. Some examples of autosomal traits are inability or ability to roll the tongue, widow`s peak or continuous hairlines among other. Autosome dominant traits occur due to a dominant allele that is present in one of the autosomes. For this allele to be manifested in the phenotype, it has to be inherited from either of the parents. Because of this therefore, any child stands a 50 percent chance of inheriting the allele and showing the trait that is inherent in one of the parents (Clark, et al., 2003). Example of sex-linked trait is color blindness. Males have Xy chromosomes and females XX chromosomes. In that regard, therefore, in order for a female to be colorblind, then both X chromosomes nee...