Inheritance of Fish Stripes

Inheritanceof Fish Stripes

Inheritanceof Fish Stripes

Traits can either be autosomalrecessive or dominant. An offspring receives an allele from bothparents. A dominant trait requires only one allele so that it isexpressed as a phenotype which is the physical appearance of theindividual. Alleles represent different forms of a particular gene.Each organism contains two genes for each trait, and the genessegregate during meiosis and, therefore, each gamete has only onegene for a pair (Hasunuma, 2009).

Thefish skin pattern expresses fish tripe genes. The offspring hasinherited the stripes from the parents. One parent exhibitshorizontal stripes while the other one vertical bands of color. Thedominant and the recessive genes determine the traits that becomevisible in the offspring. If either one or both of the parents pass adominant gene to the fish, it is the same genetic material thatbecomes prevalent. If both the parents pass the recessive gene, it isthe recessive gene that is expressed (Hasunuma, 2009).

Therefore,it is possible that the homozygous dominant or heterozygous gene forthe horizontal stripes has been expressed in the offspring (Maroni,2001). For example, if an allele for the horizontal line is B andallele for the vertical stripe is b, Whereby B is the dominant and bare recessive. A fish with horizontal stripes can either behomozygous BB or heterozygous Bb. In this case, the fish hasinherited heterozygous Bb from both parents. Therefore, its genotypeis Bb. The trait that appears as a phenotype is the vertical stripessince the dominant allele overcomes the recessive allele. Thegenotype of the offspring is as a result of the combination of genesin gametes that comes together during conception (Maroni, 2001).


Hasunuma,K. (2009).&nbspGeneticsand molecular biology.Oxford, U.K: Eolss PublishersBottomof Form

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Maroni,G., &amp Wiley InterScience (Online service). (2001).&nbspMolecularand genetic analysis of human traits.Malden, MA: Blackwell Science.

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