University:
Cambridge College
Course:
SCI 225W | Foundations in Biology
Academic year:

2023
Views:

261

Pages:

1
Author:

M Theodore

Alleles and Multiple Alleles Loci are smaller units on chromosomes that give a shape like a series of beads or ribbons with transverse lines that indicate the location of genes.Gene A and gene a are identical genes, because they are located in the same locus and control the same or equivalent traits but their expression is different. For example, gene A and its allele a both control the shape of the nose, but gene A expresses a sharp nose, while the allele of gene a expresses a flat nose. One gene can have more than one allele. The order in writing pairs of multiple allele members is adjusted to the order of dominance of one trait over another. Events that indicate a gene has more than one allele are called multiple alleles. Examples: 1. In rabbits there are a series of multiple alleles that influence the color of the rabbit's fur. The normal fur color of a rabbit is gray (plain) determined by the C allele. The C allele undergoes a mutation and produces 3 types of alleles that deviate from the original, consisting of:  Cch, has a light gray (chinchilla) phenotype.  Ch, has a white and black (himalaya) phenotype.  c, has an albino phenotype (not pigmented).The order of dominance is C > Cch > Ch > c. 2. In humans, it is known that there is an ABO blood group system which is inherited by multiple alleles of a gene. In human blood type there is one gene, called gene I, with double alleles, namely blood type A allele IA, blood type B allele IB, blood type AB allele IAIB and blood type O allele IO.The order of dominance is IA > IO, IB > IO while the IA allele is not dominant over IB and vice versa.

Alleles and Multiple Alleles

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