LIFESCI 2G03 Study Guide - Final Guide: Abo Blood Group System

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20 Mar 2017
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A common misconception we have in genetics is that there are only 2 different alleles for each gene. These two alleles are the dominant and recessive allele. Codominance and incomplete dominance can also occur during allelic expression. Acco(cid:396)di(cid:374)g to me(cid:374)del, i(cid:374) the p(cid:396)ese(cid:374)ce of 2 alleles o(cid:374) a ge(cid:374)e coding for a trait, one allele will always conceal the presence of another allele. Rather than both alleles contributing to a phenotype, the dominant allele will be expressed exclusively and the recessive allele will remain latent. The recessive allele will only be expressed by offspring that have two copies of this allele. Well, this is ofte(cid:374) the (cid:396)esult of incomplete dominance. If one parent has curly hair, which means homozygous for the curly hair allele, and the other parent has straight hair (homozygous for the straight hair allele), each offspring will be heterozygous and have wavy hair. This is a blend of the e(cid:454)p(cid:396)essio(cid:374) of the pa(cid:396)e(cid:374)ts" phe(cid:374)ot(cid:455)pes.

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